Fuel Pump Pressure Diagnosis (return type system)

Рет қаралды 67,142

2 жыл бұрын

This is a 1991 GM TBI system. I know it is old and we don't see many of these systems anymore, but the fundamentals still apply to ALL fuel pump and fuel delivery designs. From the mechanical return type, to mechanical return-less (regulator in the tank), to electronic return-less (no regulator) systems. Even the low pressure, delivery side, of today's GDI systems! Fundamentals my friends, they do not change and this video will be valuable information for troubleshooting all of these systems. Sure there are some minor differences in testing, depending on the fuel delivery design, but the core of this is the same!
What is covered in this video:
1. How to identify a lean condition
2. Visual spray pattern test of a TBI injector
3. Using the oxygen sensor to ID a fuel delivery problem
4. Measuring fuel psi on a return type system
5. How to check fuel pump max psi (dead-head test)
6. Fuel pump power and ground testing
7. Fuel pump current and RPM measurements
8. How to ID a good ground on your meter
9. Fuel pump motor disassembly to show brushes and commutators
10. Discussion of testing for bleed down issues
ScannerDanner Tools:
www.scannerdanner.com/tools.html
www.amazon.com/shop/scannerda...
For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

Пікірлер: 313

@ScannerDanner 2 жыл бұрын

@lomakahl 2 жыл бұрын

How do you reset the TPMS on a 2017 GMC Sierra? The letting air out trick didn’t work on mine.

@tomfletcher2345 2 жыл бұрын

Scanner danner, can I email you please? I've run into a no comm problem on a 11 ram 1500 5.7

@brucegill4218 2 жыл бұрын

Thanks Paul you stay safe talk to you later

@rickyboyd2919 2 жыл бұрын

I’ve been waiting on this video for 2 years. I’ve had troubles ever since my filter was clogged. Many thanks for the video. You provided details that others glossed over or didn’t show. 1995 K1500 TBI here. Your doing some good in this world in many ways.

@ScannerDanner 2 жыл бұрын

@@rickyboyd2919 thank you for these words tonight, felt divinely influenced because I needed to hear this

@ricothechimpanzee6596 2 жыл бұрын

Hey scannerdanner! Last week our van broke down and we just so happened to breakdown next to you and you ended up saving our church van from a rats nest in a part of the engine, we got down safely and had an incredible time and I wanted to say thank you once again for helping us!

@ScannerDanner 2 жыл бұрын

This meeting was ordained by God, no doubt in my mind. I can't stop smiling every time I think about it. I got to see some of the worship on some FB posts and I would have loved to have been there with you guys for that! This entire thing felt like I got to meet part of an extended family that I didn't even know that I had. Pray for me to be a light in the darkness as I will do the same for you.

@dans_Learning_Curve 2 жыл бұрын

Awesome! Good stuff! So, it was rodent damage?!

@PistonShack 2 жыл бұрын

Such a coincidence) I just replaced weak old 17 years old Fuel Pump on my Nissan Titan. All troubleshooting was done according to your book! God Bless You!

@ScannerDanner 2 жыл бұрын

heck yeah! awesome, thank you

@htownblue11 2 жыл бұрын

What a thorough breakdown. This diagnostic process eliminates variables one by one and helps to ensure the correct course of action is the final decision. An hour of diag time is worth three hours of needless parts shotgunning. Well done Danner as always. Watching you and your brother cut up is a bonus.

@ScannerDanner 2 жыл бұрын

thanks so much! And yeah, working with my brother with my son filming is a pretty cool dynamic :-)

@frankgonzalez24 2 жыл бұрын

My dad owned a 90 chevy van that had that same TBI setup. It was the first fuel injection setup I ever worked on. It is real easy to work on and fixed compared to todays F.I. setups.

@throttlebottle5906 2 жыл бұрын

easy, except for it being a van and requiring half the interior removed to get at it. lol

@cullenmiller8170 2 жыл бұрын

Okay now that I watched this and slacked off enough this morning it's back to your lectures on the Verus scan tool. The one I bought came with the board and I can follow your class along. Lecture 12 here I come.

@ScannerDanner 2 жыл бұрын

Nice! Thanks Cullen

@dmto7430 2 жыл бұрын

Good find! Shout out to the owner that keeps the truck in such a nice shape! Also, Ivan had something similar on "Eurotrash" last episode where a plastic line got disconnected internally. But first he had to undo all the other stuff people had doing beforehand to even be able to diagnose it, was quite a case.

@donspirz4199 Жыл бұрын

I couldn’t believe it when I seen it! I just removed my neighbor’s fuel pump in his 1991 GMC Sierra TBI. I watched your video and did my testing the best I could with just my multi meter. I determined it was the fuel pump since I do have voltage with a load and a solid ground at the pump and no fuel pressure at all. My filter was restricted but not blocked but figured the pump went out because of the restriction (old age). I tilted the bed and removed the pump and took a look at it afterwards and I couldn’t believe that mines had a crack (tear) in the exact spot as the one in your video! The exact same truck, make and model. I watch videos to get myself familiarized before I start and see what I might run into since my mechanic days are over for me because of my age (70). The symptoms I had are exactly like yours in the beginning of this video. Engine starts but won’t stay running and can’t increase RPM’s, falls flat on its face in a second or two. Would run if spray carb cleaner into the throttle body. As soon as I seen the tear in my pump, I remembered this video and had a good laugh that is had the exact same problem. I’m lucky here in Hawaii as our vehicles aren’t rusty underneath, all of my fasteners were easy to remove with minimal rust. Thanks for the video and tips which made my experience in fixing my fuel problem easier to resolve.

@brucegill4218 2 жыл бұрын

Hey Paul it's Bruce again thanks for showing me that 91 I have a 1992 Chevrolet c1500 with a TBI on it my friend had that same problem but he didn't let me get to the fuel system before he started changing a whole bunch of stuff and by that point it was screwed so thanks for showing me that as soon as I get some money I go back to work I'm going to be getting on your your scanner dinner premium web page website with KZfaq and I'll be ordering your your books I want to take your class so I'll see you in a few weeks

@ScannerDanner 2 жыл бұрын

thank you Bruce! Look forward to hearing from you in the comments on the premium channel

@darrenroth6250 2 жыл бұрын

I appreciate you going one step further and showing where the fault in the pump portion was.

@ScannerDanner 2 жыл бұрын

Thank you!

@KnuckleHeadGarage27 2 жыл бұрын

Haha these videos with ur brother in the back ground either eaten or singing is hilarious always good to see videos like this and especially on older vehicles . But i had a 88 S10 2.5 5speed an it did this issue an worse on turns an so i had a idea to fill the tank up or put more gas in it an sure enough that's exactly what was wrong the hose inside the tank for the fuel pump had a hole in it and when I had a full tank it would run good . An then I started to hear the fuel pump spraying inside the tank from that hose being bad so I knew for sure that's what had happend .

@eriksheridan2923 2 жыл бұрын

Hands on is everything no matter what year it is love the vids bubba

@scientist100 2 жыл бұрын

Mechanics even ask me: "Why do you buy expensive scanners?" and then answer the question themselves saying because "it tells you everything". I wonder how are they mechanics when they don't understand a tool that is so important in this industry. A lot of mechanics only think that a mechanical tool to replace parts is all they need.

@VashthStampeede 2 жыл бұрын

That "hose" isn't really a hose. It's thicker and called a pulsator. It's supposed to smooth out any pulses in the fuel delivery. A new one is supposed to come in the box with the new fuel pump. Can't ignore changing that part. Great video with lots of useful information.

@joe1273 2 жыл бұрын

No thats just a hose, pulsators are metal and look like a small old school master cylinder cap.

@ScannerDanner 2 жыл бұрын

this model did not have a pulse dampener, some did, some did not, as @VashthStampeede said, this was just a hose. Thanks! Good info for others

@VashthStampeede 2 жыл бұрын

@@joe1273 I know the part you are speaking of, however some were just a piece of hose about twice as thick as fuel hose only without braiding. It served the same purpose as the metal one. Nonetheless my point was a new one comes in the box for a reason, and should not be ignored when changing the fuel pump. If the pump had been recently changed, as Paul suspected, the changer screwed up by leaving the old one in. I've been ASE certified since it started in 1975 and know what I'm talking about.

@frankjohn4302 2 жыл бұрын

Thanks Danner.These older systems are still relevant today

@ScannerDanner 2 жыл бұрын

Yes they absolutely are

@Jacob-qz2mo 2 жыл бұрын

Love it, old school testing, Fundamentals.

@jimkillen1065 2 жыл бұрын

I always try to watch these videos great information . Thanks for all you do .

@craftsman673 2 жыл бұрын

Thanks! I feel a little smarter now... Let's get this camaro back on the road

@richardmitchell7836 2 жыл бұрын

Now we have learned why not to be a parts changer. Paul learned the hard way just like most live decisions as we all have,hopefully that is lol. Ending was awesome! I just did a fuel pump well just the hose..owner said he just replaced it with a oem. All symptoms just like this one lead to fuel pump, turned out he replaced the pump but didn't use the proper line ( external rubber fuel line) not knowing about fuel line for internal use. Always great content danners. Be well guys!

@tracydiller9378 2 жыл бұрын

This brings back memories, just goes to show how old i am LOL.Great video guys as always.

@fixitjerry 2 жыл бұрын

God bless you guys!! I love these test methods! Keep the videos coming!

@dodsjanne 3 ай бұрын

So much good info here. Invaluable

@jhauna1 2 жыл бұрын

10 Psi per amp seem to hold true here…. 10 psi gain and 1 amp gain. Awesome work again Paul, thanks for sharing.👍🏾😎

@90pontiac 2 жыл бұрын

Great video helped me with my 94 suburban with TBI. Turned out I had bad ground wire, replace and truck runs Great 👍

@ScannerDanner 2 жыл бұрын

sweet! props to you for watching through this entire video for that particular ground test

@Ken-wu6hr 2 жыл бұрын

I’m in Texas. My Family has 3 TBI Trucks. & I get a Lot of OBS customers. I just put the adapter in place of the Filter. Plus I have a working Red Brick. They also blow out the fuel hose between the pump & strainer that can throw you for a loop. My truck is a 88 C3500 tbi 454

@grantbellinger7403 2 жыл бұрын

Beautiful, completely thorough really enjoyed watching,very good matey

@nemanjadzombic6101 2 жыл бұрын

Thank you for another perfect video!!! It is very fun to watch you and your brother together. I'm disapointed you don't have more likes but I hope you enjoy making video with your brother. Caleb shoud be showing more in the video too. Watching your videos is a job for me but it's also fun. Everyone watching yours and suchlike videos must be in love with this job.

@ScannerDanner 2 жыл бұрын

Thank you my friend

@viewfromthebilge Жыл бұрын

Great information. The diagnosis process was spot on.

@ScannerDanner Жыл бұрын

Thank you

@stationaryenginesworldwide 2 жыл бұрын

Thank you Paul and Caleb great video !!

@terrybarkman3219 2 жыл бұрын

Thanks for the video! Nice to learn something new.

@rick31869 2 жыл бұрын

awesome video as always !

@randomugliness1238 2 жыл бұрын

Love these trucks! I just bought a 93 K2500 and learning about TBI through doing! Thought at first it was carbureted and I was like "Uhhh are those injectors in the throttle body?!"

@Phantomas2011 2 жыл бұрын

Love all your videos, I wish I could have seen you use the old snap on brick 😜

@robertmobileman8304 2 жыл бұрын

good job , great content, and as always great camera work Caleb .....

@IAMNOSLEEP 2 жыл бұрын

Thanks for sharing Paul... Cheers.

@whitetiger8652 2 жыл бұрын

Always learn something, Thanks guys!

@2752rang Жыл бұрын

You guys are really cool and right to the point

@nellyxavier8923 2 жыл бұрын

Just started whith fuel system ..SD Book....thank you Sir !

@ScannerDanner 2 жыл бұрын

Nice! Thanks so much! Don't let the age of the example here in this video make you tune out (some do). Fundamentals my friend, right? It still applies

@nbrowser 2 жыл бұрын

Yay I'm not the only one to use a Solus Legend...actually it's quite a nice scan tool, had mine for about a year now and loving it.

@johnc4352 2 жыл бұрын

New math formula… Count the bacon bits in Danner’s beard, divide by 3, gives you how many donuts he ate! Thanks guys.

@ScannerDanner 2 жыл бұрын

🤣🤣

@UcantBeSerious03 2 жыл бұрын

31:43 - I think he forgot that was a piece of hose and trying to operate the carb. By far my most fav channel.

@Paul1958R 2 жыл бұрын

Caleb/Danner/Paul Great video - thank you! Paul (in MA)

@garylee1544 7 ай бұрын

Love they Video's at Danner's Shop. Best Wishes Mrs. Danner!

@isalmankhan1 2 жыл бұрын

Superb, Thanks for sharing SD Love it👍 Great video on testing properly a faulty fuel pump👍 Love the math part😉 Special thanks to James Danner & Caleb👍 Stay Safe Guy's❤

@johneric3886 2 жыл бұрын

I agree James Danner seems like a pretty cool dude. It's good to watch a family atmosphere, especially this day and age...... You know I really think Paul and his brother could have a small radio show on NPR --------- they used to have an automotive show called clicking clack, I believe.

@raviautoscanning 2 жыл бұрын

Great explanation. Very important

@theomnipresent1 2 жыл бұрын

Don't knock the bacon maple bar till you try it. I had the same hesitation, now it's one of my favorite's.

@handyman5129 2 жыл бұрын

great job teacher i like the way you find the issues

@ScannerDanner 2 жыл бұрын

thank you!

@markferraro5250 2 жыл бұрын

Great job SD. truck brings back memories code 44

@ScannerDanner 2 жыл бұрын

yes!

@thomasdemarco617 2 жыл бұрын

nice to see you back on Dan tell us more about wot o2 test

@ScannerDanner 2 жыл бұрын

:-) my name is Paul, check this video out, it will give you a good idea on how to use this test kzfaq.info/get/bejne/Z5Nin9SVqauUgIU.html

@arbez.nation 2 жыл бұрын

Love the ending. Hoping for a duet...

@johncollins8304 Жыл бұрын

You guys really earn your money. Explanations very thorough so even a newbie can almost keep up. Would love to drive to you but I can't even drive in my drive let alone to the US. My car (2006 Opel Tigra Twintop) starts fine but cuts out after 10 secs. Fuel tank 1/4 full -- so at least the sender in the new pump I fitted is working. Under advice of those who know more than me, I changed the fuel filter, the fuel pump (nightmare); no difference. As for the regulator, mine is within the fuel pump assembly, fitted to and part of the whole fuel pump assembly and not sold as a separate item. I have a Schrader valve on the fuel rail to take a pressure tester but 99% of kits don't have the appropriate fitting... go figure. One is arriving Monday that is supposed to have such a fitting. If I hear the click from the rear when turning key to position 2 (1 being just pushing it in) that means electrics are fine, right? ... Or having seen your vid I'd better see if I can check the wiring plug going into the pump. Have a cheap Obd2 tool but that's not showing any codes; would buy even up to 200 dollar one if it would find the fault but have spent much time reading up on them and they all have a considerable number of detractors -- 10% of 45,000 ratings puts me off. Any advice please anyone. I see you have a vid on that so will look at it... Thanks again for your work. I don't want to be a mechanic, just be my mechanic.

@ScannerDanner Жыл бұрын

You only need to ask this question once. 3rd time I'm seeing it on various videos this morning. It gets confusing for me to follow. Reply only to my last question. Not here

@johncollins8304 Жыл бұрын

@@ScannerDanner Apologies.

@tiztiz5839 2 жыл бұрын

Very nice guys!

@ganeshnarayan5505 2 жыл бұрын

Hello Mr. Danner thank you for sharing this video i learned lot of things from your videos.

@grantbellinger7403 2 жыл бұрын

Dead right cobba

@ganeshnarayan5505 2 жыл бұрын

@@grantbellinger7403 what the hell is a cobba.

@grantbellinger7403 2 жыл бұрын

Hehehehe,it’s australia n for mate,cobba

@ganeshnarayan5505 2 жыл бұрын

@@grantbellinger7403 OK.. WHAT EVER

@alaautotonics4403 2 жыл бұрын

Great explanation thank you so much

@johnsmog3746 2 жыл бұрын

I have ran into this problem before. The deadhead test showing zero pressure increase was your clue that the coupler hose at the pump was leaking. Even a weak pump would have shown some increase in pressure if that coupler hose was good. Thank you for another awesome video.

@ScannerDanner 2 жыл бұрын

The deadhead test did not reveal anything to us beyond a weak pump. If a pump cannot reach fuel psi regulated psi (13 in this case), it is essentially running under a deadhead condition already. The regulator remained completely closed, no different than my pliers did. Make sense?

@johnsmog3746 2 жыл бұрын

@@ScannerDanner OK So in this system had you only replaced the hose the pressure may have increased but until it surpassed the regulated pressure there would be no pressure increase with a deadhead test. And of course if it did get up to specified pressure there would be no issue. Got it and thanks again for everything you and your son do for this industry.

@ScannerDanner 2 жыл бұрын

yes sir, exactly! Thanks so much too

@johneric3886 2 жыл бұрын

Excellent work, terrific some up at the end of the video. There's a chance I might join your virtual class someday. But right now finishing up my second degree.

@ScannerDanner 2 жыл бұрын

Thank you! When you're ready, you can sign up here. I offer a 14 day free trial as well. www.scannerdanner.com/join-scannerdanner-premium.html

@aussiefirestorm 2 жыл бұрын

Thank you Captain Longwind.

@ScannerDanner 2 жыл бұрын

🤣😉

@user-io3hw7hx7q 2 жыл бұрын

Awesome outstanding job have a great time thanks

@James-fs4rn 2 жыл бұрын

👍 blast from the past

@Pablo_Automotive 2 жыл бұрын

Nice explanation team Danner.

@fernandocamacho5088 2 жыл бұрын

ScannerDanner is the man!

@JD-iu3vi 2 жыл бұрын

My 89 c2500 fuel pump did the same thing. It had a split in the rubber hose. It had a full tank of gas so I did not want to drop the tank. I removed bolts that hold the bed on except the last two on the back and left them real loose. I tilted the bed up and changed the pump.

@oldbiker9739 9 ай бұрын

I still own a truck just like that one , there so easy to work on , I will never buy a new truck again , I still have the propane system and gasoline system ,and every thing still works .

@powerpower1797 2 жыл бұрын

Good video.

@mutley203 2 жыл бұрын

Hi Paul I am a retired mechanic in Dover England,in 1990 i had a fuel problem that only happened when I road test the car up a steep hill,it turned out to be a split pipe like the one in your video.it was on a Vauxhall cavalier the only time in 50 years of working on cars.look up jubilee way Dover England to see the White Cliffs of Dover bridge that helped find the fault cheers

@fire7765 2 жыл бұрын

Good job

@scrappydope 11 ай бұрын

love your videos...been reading your book...but I had the same problem with my mom 98 chevy tahoe 5.7 vortec...i usually change it out myself but my mom needed it change out since it was boggy so she took it to shop...ran good for a week or so then same thing...bought new pump and drop tank...same thing cut in hose and clamps fell off...those cheap plastic ones...install some spring clamps replaced hose...didnt even replace pump and returned after a month...been running perfect for 3 years...now im working on my 95 tbi this what brought me here...trying to figure out my problem

@ScannerDanner 11 ай бұрын

I can help for sure! Let me know if you have questions. Just reply here whenever. I get all notifications

@Jpilgrim30 2 жыл бұрын

That pico amp clamp automatically zeros every time you cycle the power on them. I love my pico clamps. Saves me a lot of money on 9 volt batteries 😂

@mph5896 2 жыл бұрын

20 years ago, one of those TBI systems kicked my butt. Rubber hose inside tank was split like that one. Special rubber hose is required for submersed fuel line. If you don't use that, it degrades and blow a hole in it.

@throttlebottle5906 2 жыл бұрын

been there done that, replaced many of them that dry-rotted and split. a tell tale sign is listening to the fuel filler with cap off and tank less than 1/4 filled, it sounds like a waterfall inside when running or key turning to prime the system or powered with test connector. make sure it's submersible rated fuel hose/section and it's always a great idea to replace the pump and strainer screen while at it! I got bit by that a few times.

@OneLegged-honda-mechanic 2 жыл бұрын

The outtakes at the end were cracking me up 😂

@alexmessina3383 2 жыл бұрын

Nice find. I had a 1997 miata recently that had a brand new pump fitted less than a year before it came to me on a hook with no fuel pressure. I'm scratching my head at my fuel pressure gauge and had to go straight to the pump outlet at the tank. No pressure. Pull the pump. Split hose. BUT. I discovered that the previous dude used a new piece of hose to connect the pump to the outlet pipe in the tank - except that it was heater hose:-O

@throttlebottle5906 2 жыл бұрын

sounds like Job Security :))

@hightttech 2 жыл бұрын

SD, you are so right. If the fuel filter is puffy-cheeks plugged on a return system, try to sell a fuel pump too. I've seen so many FP fail shortly after clogged filter, and it's annoying for customer. Not as critical on RETURNLESS system, i suppose due to system always dead headed.

@farmermiyagi1338 2 жыл бұрын

I get a lot of these where I am. I shouting at you, it's grounded where the connector is bolted to the frame!! Snatch that bed off and slam a pump in it. ;)

@JeredtheShy 2 жыл бұрын

Okay but DANG that is a clean 91

@josephsunnycalb 2 жыл бұрын

Love the shirt. Wolves At The Gate are a fantastic band.

@ScannerDanner 2 жыл бұрын

Love them too my friend! Make a joyful noise to the Lord right? It doesn't say how to do it, just do it! Love me some timely screams in my worship music 😉

@JimmyMakingitwork 2 жыл бұрын

Bacon and phlegm donuts, lol. I gotta say thank goodness for spellcheck on that sentence.

@ScannerDanner 2 жыл бұрын

🤣🤣

@douglash3129 2 жыл бұрын

Hey Paul, maybe you should try using a smaller screw driver on that hose clamp. HAHAHAHA!!

@ScannerDanner 2 жыл бұрын

🤣🤣 right?

@dpaulak 2 жыл бұрын

believe it or not i use to pull the injector/injectors out on T.B.I on gm and grind the spot weld ( carefully ) on top of the regulator screw and put it back on. Then use a 90 degree tool i made that i could "shoe horn " in to the bottom side of the throttle body unit to adjust pressure with vehicle running, 9lbs was ideal running pressure i found. Of course pump pressure had to be in range.

@peterchambers1868 2 жыл бұрын

u the MAN!

@bartscave 2 жыл бұрын

I’ve seen deteriorated hoses inside many pumps used on marine outboard engines caused by ethanol.

@thebudcat1861 2 жыл бұрын

Gates has submersible hose for this application. Had pump problem on 87 Camaro found hose connecting pump to sending unit was laying in bottom disintegrated.

@bosaadbosaad6792 2 жыл бұрын

Thank you very much always i learn from you now i will not be late to refill my tank of fuel to prevent pump of heat and loose brushes right?

@mohamedelshamy2706 2 жыл бұрын

MASTER.

@codysautodiagnosticsprogra8706 2 жыл бұрын

Always a great video Paul. Thanks for your time. Now wouldn’t checking pump rpm show how the hose is split and causing the “overrunning” speed of the pump, like being out of gas? The ones I’ve had the current is low, rpm is high is usually a good clue of out of gas or split hose in tank.

@ScannerDanner 2 жыл бұрын

it wasn't much lower, not enough for me to even think along these lines my friend. 3 amps before, 4 amps after the fix, and only about 600 rpm difference too

@aleskyfinis1025 2 жыл бұрын

Yeah I agree with you bro

@1977jelliott 2 жыл бұрын

Hey Scanner Danner, long time since I have commented on one of your videos, I have had those symptoms (carpark to workshop drive) with a large vacuum leak rather than low fuel pressure, too much air rather than not enough fuel. Obviously snap throttle test will show whether it is a fuel delivery issue but you can get caught out if you don't know.

@troysmith9453 2 жыл бұрын

I've been hired by an old boss just to do drivability work but he doesn't maybe understand why I check things the way you do so I'm going to show him this and explain why but with that said I get to use all of my tools and the knowledge continues thanks homie or should I say GRANDPA 😂

@ScannerDanner 2 жыл бұрын

You have to show him one with a bad ground kzfaq.info/get/bejne/qLdnp9l63be3pGQ.html And why we do these "extra checks"

@xfire7 2 жыл бұрын

Man you`re a magictian .

@Lambros_Stefaneas 2 жыл бұрын

magictician.

@LAW-fv6ys 2 жыл бұрын

I've had a fuel pump on a 2.0fsi vw golf 2006 which would run great for nearly 2hrs and then misfires into limp mode not allowing over 3k rpm. Turns out if I had low fuel level it would do it sooner than 2hrs, especially if I stayed in a layby after a hard drive and let it heat soak. The reason was a weak pump which when the return fuel comes back to the tank its hot and then warms the whole fuel tanks fuel, this caused the pump to become weaker to the point it would reduce flow under load. Was a very hard one to diagnose. Live data on vcds logs just caught it once so I could see the tps go to 0, even though my foot was planted, the rpm bounce at 3k in limp mode and then I could see the low side pressure had dropped from 5.5bar to less than 3bar. The new pump held 6bar dead irrespective of load and its is pwm system so it should hold a fixed value. The hpfp is also a big failure item on these cars but the live date log showed the hpfp pressure were excellent. Is there any way to fault find this any type of issue any quicker guys?

@oneilwilliams653 2 жыл бұрын

I couldn't pay for this knowledge, thank sir.

@soupflood Жыл бұрын

What i like about TBI is it's so exposed, just like a carb, only better because you can actually see the spray pattern.

@MarioDallaRiva 2 жыл бұрын

Bubbles and socks...I saw them at the peeler bar many years ago! Mmm, doughnuts mit bacon 😋😋

@d.d4184 2 жыл бұрын

Brilliant. Sd premium worth it's weight in gold.

@ScannerDanner 2 жыл бұрын

Thank you!

@ralfsautomotive 2 жыл бұрын

LOL, Awesome, been there done that. I remember there was some issues with the Ground on those. 13/16 = 0.8125" 20/25.4 = 0.7874 LOL I had to.

@dyardsale5475 6 ай бұрын

Scanner Danner is awesome.

@DillonTurner395 Жыл бұрын

Purchased a 91 s10 with a 4.3. Dude unloaded a parts cannon at it because it would idle up and down, and die when given any throttle. Fuel was dripping out of the injectors trying to run so I questioned injectors but didnt want to just fire injectors at it. Guy had already replaced the entire throttle body but that still doesnt mean it was good. Infact I think the throttle body came from either a 5.0 or 5.7 because it ran fairly rich after replacing the pump. Found on a forum that with a fresh pump if you unhook the filter itll shoot fuel like 6 feet. I unbolted my filter, keyed it on and barely got a dribble. Put a pump in and tried the same thing and ended up with the gas version of a super soaker under the truck lol bolted everything back and it ran very well after that just rich.

@NorthernIrelandFishingReports 9 ай бұрын

Hay bro. Great video. Can you tell me. Would a blocked injector cause high fuel pressure.

@fmbfla 2 жыл бұрын

That pump looks like one that was not designed for ethanal fuel causing the rubber to "rot The use of an adjustable timing light is what I used to watch fuel injector pulse to the TBI's to check fuel delivery or a clogged/dirty injector.

@jkkennedy8919 2 жыл бұрын

This guy is a real automotive technician just pure Genius I need his brain cells lol 🔥💪🏿

@ScannerDanner 2 жыл бұрын

thanks man, I've just been doing this a long time and I love what I do

@jkkennedy8919 2 жыл бұрын

@@ScannerDanner man I’ve been working on cars for 23 years started working at a Chevy dealership now I work on fleets for a company called Melwood in Washington DC I’m trying to get my electrical skills down pack like you. I never been to a school and the dealership never sent me for training just been learning on my own but I really wish I could attend your class in person I would learn so much

@ScannerDanner 2 жыл бұрын

@@jkkennedy8919 you've found the right channel my friend, at least I can teach you remotely right?

@jkkennedy8919 2 жыл бұрын

@@ScannerDanner yes sir man I watch your channel when I’m at work when I have nothing to work on