This is the kind of person that was smart enough to do anything he wanted in life but decided to become a mechanic, therefore a "best of the best" technician/instructor.

EXCELLENT troubleshooting / diagnostic testing !!! Just can’t say enough about this brilliant young man who put all of his diagnoses in laymen’s terms so a not so smart guy like me could comprehend .... lol . Very good ! Thanks so much .... Jack

Very prepared, went smoothly, spoke clearly, and I learned something...Thanks Michael.

This was very informative and easy to follow along. Thanks especially for showing the need not to have to drop the gas tank.

You sir deserve a medal of some sort. This has by far been the most informative video I have watched in the past week. Hundreds. Thank you sir.

Outstanding diagnosis, fix, and explanation. Thanks for the lesson!

Awesome video! Wish I came upon this sooner...just a shadetree guy...but this is the first video that really explained why I've been chasing my tail so much with evap codes on my 08 Silverado. Thank you very much!

Excellent video. You definitely have what it takes to be a great teacher. Great explanations 😊

Excellent case study. I really like your diagnostic approach. Thank you sonics for this class. Looking forward for next one. Cheers.

Hey, I'm here for a 05 Express 3500 with a PO449 but thought I'd watch anyway and am very happy I did. I am definitely going to subscribe since this was one of the best "classes" I've ever seen on KZfaq. Thank you very much.

Thank you very much, and for the innovative way to diagnose faults. I am one of your biggest fans, and I have watched all the videos that you uploaded, and I hope that you will continue to upload more scientific videos, You really are a genius engineer I wish you very good luck👍🏼

found you from South main Auto repair, Excellent info on the old gm evap system. Great Work Mike will be back and telling friends.

Great video. It was very professional, informative yet simple. And i loved how you showed the struggle of installing the sensor. I thought you removed the connectors and sensor WAY easier than most. So you are human like the rest of us. Haha

Excellent video and that's after just coming off of finishing ScannerDanner Premium's full class lecture playlist course. You're definitely up there with the best of them. I really appreciate Wells supporting this channel like this.

I need a better scan tool and need to brush up on my troubleshooting on wirer harnesses. My scan tool just kept reading P0446 vent control circuit. This taught me that not everything is as it seems. Kudos to you man, this video helped me fix my problem thank you.

Excellent video!! Very clear and precise!! I found a reference to this channel from Eric O. at South Main Auto channel! You should give him a shoutout back! In the system info, the number 12.XX mmHg, is a reference to millimeters of mercury!! Hg is the periodic table of elements symbol for Mercury!! When you measure Vacuum, as in a typical A/C system, it's measured in inches of mercury (in Hg). And a typical cross over measurement would be inches of water, in SAE numbers!! I recently had to do this specific job (private, for a friend)! He was showing a evap performance code. He replaced the purge solenoid, at the behest of the O'youknowwho parts store!! PARTS CANNON ATTEMPT #1. That didn't work, so, he called me for a favor! I came, and immediately tested the vent valve!! It worked, but after two or three tries, it started to work only intermittently! And I showed him my findings!! That it was partially working, it needed to be replaced! The money light returned!! PARTS CANNON ATTEMPT #2. I used the code scanner at the parts house, and noticed that the tank pressure was absolutely following the purge attempts, and the pressure spikes, however, it was working but showed 6 in/Hg as atmospheric!! So, even tho it switched up and down as necessary, it wasn't calibrated correctly!! A quick pop of the fuel cap, proved my points!! But changing the sensor was a bit bad for me!! The truck had been used by the previous owner, to haul mulch!! For a while I'm guessing!! And the mulch ended up on top of the fuel pump area, AND SOLIDIFIED! Half a tank of fuel, no way to disconnect the plugs. Laying on the ground, with jack and stands!! Oh boy what a favor that turned into!! We spent hours chipping out the mess, just to get the tank out!! And then the clean up began!! What a job!! But the tank went back in clean, dry, and empty!! With a new sensor!!

Thanks Mike, This is a refresher for me My next job is a P0446 on a 04 suburban flex fuel. Thanks!

09 Silverado, new ac delco purge valve, new Standard vent control valve, new Gm gas cap. Shop advised to change vent solenoid. Truck sometimes very hard to fill with gas then no problems filling. Vent canister is not plugged. Perplexed. Glad you posted this. I only have a bluedriver but I’m going to check the pressure readings. On live data the pressure fluctuates between -14 to positive while driving.

Great job Mike. Your excellent understanding of the system and critical thinking along the way sure help you make it look easy. But I was right there with you at every step. You just made a lifetime customer with that truck owner. BTW, love rockin' my wellstech "T" shirt. Thanks Mike and looking forward to your next class. It's Thursday the 13th correct?

Mike great work here. I came across your site channel today. Oh yes I have subscribed. I am 60 years old and am amazed at your level of talent and dedication.

Degree in electrical engineering and a mechanic! Awesome job! My mechanic has come to the same diagnosis as you!

Excellent teacher. Well done on diagnosis! I have a p0446 on a 03 suburban. I’ll check the vent line and solenoid for clogs before having to drop the tank since top of suburban tank isn’t accessible unless tank is dropped. Tried a gas cap but of course that wasn’t the issue.

One of the best how too videos I have ever seen.........

Thanks for sharing Good video It's good to learn more about Electric car problems Very professional teaching. 🤗🤗

Informative and professional...not annoying like other quirky videos out there.

I'm learning so much from you! Excellent Teaching!

Great diagnosis video. Thanks for taking time.

Evap system has been a mystery to me. But with it being the worst offender when it comes to setting up the MIL light I am glad to have come across you alls Chanel I am sponging up all of this info thanks , can't wait to catch up with the rest of them.subscribed!

As Lord Shaxx would say, this is amazing. Just solved my Chevy Silverado P0446 code that the Stealership said was the vent solenoid. Saved 1K+ 🤙

Great Video, helped me fix my 03 Silverado, Thank you!

Safety when doing the reach around. Using the sharp edge condom tape was genius Mike! This video went down smoother than the delicious India Pale Ale I was drinking while watching. Great job once again, thumbs up.

Nice concise clear explanation, ur videos are getting better all the time, anymore colorado videos would be great to see, especially a thermostat change, thanks

My 2003 Colorado the frame rotted out so bad it almost snapped in half . This truck is not too bad but is on its way to rusting in pieces. Good video it is helping me with my 2003 Aurora . At present it is constantly venting so I am assuming it is the vent valve . I was a auto mechanic for years .

Extremely badass vid bro love ur style had my attention throughout the whole thing looking forward to doin this test on my 04' colorado..p0446 just popped up smh..

Just came back to say this fixed my check engine light with this code. Had I not seen this video I would have change the canister. It really is not easy but it's not impossible. I did it without a lift. Lowered the tank just enough to reach the sensor. Code clear and it's been six months

Very well explained and your camera work is excellent.

Thank you for the video. I've been trying to figure out what sensor tells the computer there's s problem (pressure, vac, flow, ???). I've tested the EVAC systems individual components; they're working properly. I'll be testing that pressure sensor tonight. Troubleshooting and theory. Great video

Excellent presentation!! Well Done! Thanks.

Thank you for this nice and very well explained video ,bravo !

Brother, that is a very well done video my friend. I have an ‘12 GMC Sierra quad cab 5.3L with a tad over 167k & just like my motorcycle n’ things, I keep ‘em in great shape. Just yesterday I got this code, so since I don’t even have a basic diagnostic tool, I had Autozone at least pull up what the code was that caused the check engine light, that bein’ P0446 EVAP. I’ve yet gone to school for auto mechanics, but am an aircraft mechanic in the USCG & am able to hold my own bein’ mechanically inclined. Autozone’s results they printed up said that most ASE certified mechanics have typically replaced those fuel pressure sensors on GM vehicles. Gonna take it to Christian Automotive tomorrow here my state Lonestar state of TX n’ have them pinpoint the discrepancy with a better diagnostic system as you have. Again, thanks for the informative video brother! God Bless, Jason

Nicely explained and made look simple.

Great video mike, that's a trick code,cheers and take care yourself

Excellent lesson. Thank you!,

another great video. crisp clean approach

Great video Mike with the diagnosing as it just shows that you've got to understand a system if you're going to troubleshoot it. It's pretty obvious that the other shop didn't do any diagnosing and was making a call based on parts failure such as the vent valve. That sure did look like a bear reaching over that edge, but it's better than dropping the tank. Oh, how is the little fella doing and hope the rest of the family is doing well too? Take care Mike...Terry

Excellent video. Thank you sir.

excellent video. Thank you for all your help.

Awesome video my guy keep em coming

Very informative! Thanks!

Excellent video!!! Thank you very much!!!

Excellent video!

Thanks so much, informative video.

Thanks for the video. Super job ! I’ve noticed most of the diag videos I’ve seen always include a wiring diagram that you guys just “pull up” . Is there a website or is it one of those $2000 a year subscription things. I’ve always had to go get a vehicle specific manual for whatever I was working on. I don’t do it for a living but I help a lot of people in my community and at work. Keep up the good instructional videos as I am learning a lot. Thanks!

great class as always

Great video man! thank you.

Great video lecture!! I have the same issue on my 2001 isuzu rodeo 3.2 v6 2wd. They replaced the vapor canister and the purge solenoid next to it they performed a smoke test. Also, the purge solenoid in front of the engine plus the 2 vaccum hoses in front of the engine as well. In addition a new fuel pump. But still that pesky check engine light still comes on P0446!!! do you think its the same issue fuel tank pressure sensor? please help? thanks

Man you just awesome 👍 thanks for the help.

Very informative video ...thank you

Great video, thanks.

Great job, nice scan tool to have. Mine started small leak for a few years now Gross leak. GM seems to have different charcoal vapor canisters.Mine has 3 ports. Sites show charcoal gets into the lines. My first thing is to smoke test. 2004 Suburban. Ohm, continuity test purge valve19.4 all good. Will check with 12 volts. You’re too far for my drive. I’m old school, amazing Technology, you explain it well. 👍

They are very tuff to get back in!! I did mine 06 gmc! I:don’t feel like ever doing another!!! 💙✝️

Great video and tips

Grasias amigo. Eres un profecional You are very intelligent

Awesome video real professional.

Awesome video. Thank you.

keep up the good videos man!

Very good video my friend thanks

Appreciate the video , explained every part and why very well. What is the diagnostic tool you used to read all the information on the vehicle ? Thanks again , you do an awesome job !

Awesome video

3 years ago I cut a hatch in the bed over the fuel pump location . My tool box sits on top of it anyway. Now that I have to change this sensor what a dream to have the hatch just lift it up change the sensor and done in 15 minutes. The reason I put the hatch in in the first place was because my research told me fuel pumps and this sensors are problematic in 1998 Chevy's and I needed to change the fuel pump at the time and being that I dont have a lift and I'm too old and fat to crawl under and do this from below I figured cutting a hatch w a grinder would pay off some day and today is payday.

Is it a good idea to replace the whole fuel pump assembly as a preventative maintenance since, the pressure sensor comes with it? I do have a running pump that's at least 10 years old but I dont know if I just do the whole assembly or just the sensor for P0446 code?

Great diag/training video. I appreciate the thorough explanations.

Awesome, thanks.

Excellent!!!

Thank you for shining some light. Swapped the actual evap valve. $35 oem part and $100 for mobile tech to drop tank. Code didn't clear. Also asked him to swap fuel pump's float sensor since I run out of gas when gauge says I still have 1/8. So now replace FTP and float lever. (2005 Chevrolet Uplander)

in the 07 chevy express 3500 s gm supposedly added a mouse hole so you can access the FTPressure sensor thru a hole in the side of center storage drop down compartment .

Again outstanding work so smart maybe now I can fix my chevy aveo code po446

Hey Mike, I trying to replace the fuel tank pressure sensor on my 2010 GMC Sierra. Any tips? I’m having a hard time getting either connector off and I am not able to pull the sensor out. It’s a pretty tight space.

Mike, you said you used a fused jumper wire from the 5 volt ref to the signal wire, what amp fuse did you use?????

Very thorough, Mike you're wizard...just curious once you saw the connectors and determined clip style other than needing a free hand, when you placed flashlight did you realize you pointed it at an area that you were blindly disconnecting by touch only. Actually had a StarWars feel to me, let the force guide you luke..oops Mike. Diag guru. You're awesome 💪👀💪

👍 WELL DONE

I'm confuse @ 18:15! Did you take a jumper wire and connected the 5v ref to fuel tank pressure on the pcm and then you jumped the signal and ground on the connector? If you did I just learned something new, thank you much but will not do it with a 12v, like you said. Also to make sure my pcm is ok can I just back probe the my signal + and - @ the connector then use a multimeter to determine my voltage? If I'm wrong please correct my ignorance? Thank you much

can you replace the fuel tan sensor on a 04 yukon without pulling tank?

Well done, what a professional video! When you jump the 5V ref to the signal wire, would it ever be wise to add in a resistor, maybe 5k ohms, in line with the fuse so that any current through that wire would be negligible?

I have an 05 silverado 2500hd 6.0. And started getting the same code. So hopefully it's just the sensor or it could be the evap canister.

the classic reach around Eric O terminology

Good stuff

Had this code (P0446) on my 2004 Silverado. Turned out to be the fuel pressure sensor. I should have watched this video first. I changed the EVAP Vent solenoid. Check engine light didn't budge. I then changed the purge valve in the top of the engine. Check engine light still on. I had to unbolt the truck bed and lift it partially to get to the fuel pressure sensor. But that did the trick. It's been a few weeks and the check engine light has stayed off. And I was able to pass smog. Hopefully it doesn't come back on.

Well Done Video!!Question: Can I replace the Fuel Tank Pressure Sensor on a 2007 Avalanche without removing the Gas Tank as well?Or should I remove the Tank? Also, would it have been better to connect the wire before installing the new sensor ?

Absolutely loved the video. Very clear instructions. I have a 2008 siverado with the same issue and code. Dealership couldn't find it but said the purge valve and solenoid were fine, so its gotta be the pressure sensor right. The video showed that it's possible to test and change it without dropping the tank, although not easily. Is that possible with a 2008? Seemed like a different body in the video

I have a VUE that has the po446 right now. Sensor constantly reads 4.2v or higher and shows -13.25 h2o at all times. We pulled the tank and ran the tests and everything looked good. Replaced the sensor and right back to stuck at 4.2v. Figured we got a bad sensor, so we ordered an AC Delco. Still showing over 4 volts. I'm a bit confused on this one.

good one mike.

good job

What could cause my chevy hhr too idle rough when I open the gas cap too refuel, it doesn't throw any codes or stalls

I have a 2005 silverado 5.3 and mine popped up the p0446 code but mine says evaporative emission system vent control circuit can i get some help? It also took out another code recently p0300 for a random-multiple misfire please help

Thanks now if I can explain it to my mechanic he can fix my truck. Randy Bang

Might want to grab a cheap endoscopic camera so you can watch where you're going with both hands free. Great video and advice. Thank You

06 Chevy trailblazer LS 4.2 Check engine lite on High purg And hard to restart (excessive cranking) after fueling Rough idle while fueling Where would you suggest I start looking

What type of grease did you use on that FPS O-ring?

If everything is correct and wiring is OK and the light still stays on,do you think that re-flashing the PCM to stock would eliminate light?