How To Diagnose An Impulse Fuel Pump

  Рет қаралды 172,008

Skylar Hill Shop

Skylar Hill Shop

4 жыл бұрын

How to easily check the function of an impulse fuel pump. I forgot to state that obviously you should make sure you have plenty of fuel in the tank. (we've all been there!)
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Пікірлер: 112
@AlaskanAdventure
@AlaskanAdventure 8 ай бұрын
3 years later and your post is still helping this old sourdough Alaskan today with a proper diagnosis..makes total sense..you ROCK! ThanX for taking the time!!
@GApawpawandnana
@GApawpawandnana 3 жыл бұрын
Thank you for taking the time to post this. I’m a widow learning to work on all my outdoor equipment and this was very helpful. Now I will also be able to pass this knowledge on to my grandsons.
@markjohnson7508
@markjohnson7508 2 жыл бұрын
Sorry to hear of your loss. God came for our mother last Wednesday. She is missed... alot. Yea. Just be sure to get oem. More expensive but it is worth it for things like this. Air filters and oil filters spark plugs and minor things Ike that doesn't matter as much
@jayjernigan6485
@jayjernigan6485 3 жыл бұрын
Cool, aXe, I missed it. Very informative, straight to the point. Thanks.
@kleissrod
@kleissrod 2 жыл бұрын
Never knew what an impulse fuel pump was or how to test it. Thanks a bunch.
@zacherywilliams6466
@zacherywilliams6466 3 жыл бұрын
Just want to say thanks, I had been wondering and I sa aw your video and it its straight to the point very clear great job!!! Thank you
@jamessmith-wn7ty
@jamessmith-wn7ty 3 жыл бұрын
Thanks for the info, I looked at 4 other video's before I found you. your instructions are good. Thanks again.
@SkylarHillShop
@SkylarHillShop 3 жыл бұрын
You're welcome, have a great weekend!! Thanks for watching
@tylerstill647
@tylerstill647 3 жыл бұрын
Informative and straight forward. Love it.
@briancarrozza2763
@briancarrozza2763 2 жыл бұрын
Thanks, aXe; excellent video. Now I know how to troubleshoot an impulse fuel pump.
@LouisianaTractorworks
@LouisianaTractorworks 4 жыл бұрын
Hey that's a great tip aXe!! Have a good day my friend!
@eclipse245
@eclipse245 3 жыл бұрын
Great vid helped with troubleshooting. Thanks!
@rogerdevero8726
@rogerdevero8726 Жыл бұрын
Well Done. Simple, Direct and Straightforward; Liked & Subscribed. Thank You John 14:6
@champnessjack1154
@champnessjack1154 3 жыл бұрын
Thanks, very useful. I have a brand new DR brush mower that cranks but won't run. DR wants me to check the fuel pump and now I know how.
@edwardkane3237
@edwardkane3237 Ай бұрын
It was just as I suspected. Your video confirmed it for me. Thanks for sharing it with us on KZfaq.
@owenboyd6258
@owenboyd6258 2 жыл бұрын
Good video, straight to the point
@kentwright5346
@kentwright5346 2 жыл бұрын
Very much appreciated. Thank you for sharing this.
@cloudcity00
@cloudcity00 2 жыл бұрын
Great vid thank you. Helped have a better idea on my ezgo golf cart.
@bryancorso4056
@bryancorso4056 3 жыл бұрын
Thank you definitely helped going to buy a new fuel pump now
@Ashroyer86
@Ashroyer86 Жыл бұрын
You deserve more views on this.
@mebcool
@mebcool Жыл бұрын
Great job on your video sir. Thanks a bunch.
@SkylarHillShop
@SkylarHillShop Жыл бұрын
You're welcome, have a great weekend!
@eamonregan7471
@eamonregan7471 Жыл бұрын
Thanks for information just what I need
@MidnightMogwai
@MidnightMogwai 2 жыл бұрын
You’re a legend. Thank you!
@SkylarHillShop
@SkylarHillShop 2 жыл бұрын
You're welcome, have a great week!
@henryparrott2447
@henryparrott2447 Жыл бұрын
Great job 👏
@johnlibonati7807
@johnlibonati7807 2 жыл бұрын
Excellent video!
@SkylarHillShop
@SkylarHillShop 2 жыл бұрын
Thanks!
@mobileempire5522
@mobileempire5522 2 жыл бұрын
Very helpful thanks
@tompace6916
@tompace6916 Жыл бұрын
Very helpful sir
@johnnybobblalock6729
@johnnybobblalock6729 3 ай бұрын
Thanks for posting this!
@SkylarHillShop
@SkylarHillShop 3 ай бұрын
You're Welcome!!
@wesnkrissytoehay792
@wesnkrissytoehay792 2 жыл бұрын
Man thanks bro!
@stealhty1
@stealhty1 3 жыл бұрын
Great Video Man Thx ,,,Probably its just dirty from seating there, try to clean it first
@shanemyers4142
@shanemyers4142 Жыл бұрын
My pump flows fuel without turning the motor over. Also is it supposed to hold any vacuum I add to it? I used a vacuum gun and the guage goes down as if it ain't holding.
@112669gene
@112669gene 3 жыл бұрын
Thanks good info
@parneypots
@parneypots 3 ай бұрын
Nice work
@SkylarHillShop
@SkylarHillShop 3 ай бұрын
Thanks, have a great weekend!
@davidkanengieter
@davidkanengieter 2 жыл бұрын
Very good video. What does it mean if you have a weak or no pulse coming from the crankcase hose?
@rossokeefe9268
@rossokeefe9268 Жыл бұрын
I'd like to know the same thing
@SkylarHillShop
@SkylarHillShop Жыл бұрын
Look for a hole in the impulse line. The impulse is cause by the air displaced in the crankcase from the piston. If the engine is "worn out" It would have no impulse.
@kellyballard7582
@kellyballard7582 3 жыл бұрын
Might of checked the fuel supply line to make sure fuel from the tank wasn’t obstructed.
@ktpowerwashing
@ktpowerwashing 2 жыл бұрын
Fantastic, thank you
@SkylarHillShop
@SkylarHillShop 2 жыл бұрын
You're welcome!
@BP-1972
@BP-1972 2 жыл бұрын
Thank you. I have an issue where my lawn tractor will run good for 15 minutes and then it starts cutting out and I notice the fuel filter barely has any gas in it. I'm guessing it's the fuel pump but I'll use this method and see what happens.
@shannonp4037
@shannonp4037 Жыл бұрын
What did you find out? My cub just started doing this.
@MrHanowski
@MrHanowski 9 ай бұрын
How much fuel pressure is generated by a Mikuni pulse pump? Where can I find specs?
@NinoSpinner
@NinoSpinner Жыл бұрын
si può montare una pompa come questa su un 85 cc senza il tubo del vuoto che da l'aspirazione? grazie per una tua risposta
@joedarden2276
@joedarden2276 11 ай бұрын
Outstanding
@davehimlin2374
@davehimlin2374 Жыл бұрын
should a new fuel pump , get a small amount of oil squirt in it, before hooking it up, to perhaps lubricate the inner rubber diaphragm. ? ..perhaps even use a bit of 2 stroke oil inside of it for lubrication prior to hooking it up ?
@SkylarHillShop
@SkylarHillShop Жыл бұрын
I wouldn't. It doesn't need anything to lube or soften the diaphram.
@OldGuy70s
@OldGuy70s Жыл бұрын
will it work if u remove/bipass the pump.... none of my briggs had 1... My Tecumseh will only start after a shot of starter fluid.... Then runs by itself fine.?
@SkylarHillShop
@SkylarHillShop Жыл бұрын
The Briggs probably didn't have one because the tank was high enough it would gravity flow.
@user-wq2ob9wj1t
@user-wq2ob9wj1t Жыл бұрын
check one with a gauge and see what kind of pressure reading you get compare a new one to a old one
@Samlol23_drrich
@Samlol23_drrich 2 жыл бұрын
The line going to the carb flows gas when I remove it. Even before I start the ringing. Should it? My issue is that there is too much gas getting to the carb. Thanks.
@SkylarHillShop
@SkylarHillShop 2 жыл бұрын
What symptoms are you having is it leaving a puddle of gas engine is off, does it run too rich?
@Samlol23_drrich
@Samlol23_drrich 2 жыл бұрын
@@SkylarHillShop no puddle. Just running too rich. So far I've freed up the choke spring that was keeping the choke closed and not springing back. That may have been the issue, but the fuel was only 1/4 full in the clear fuel filter. I always thought those completely stayed full. Blew some carb cleaner thru it. But when I wanted to make sure the fuel pump was working (one of those suction ones) i took off the tubing running from the pump to the carb. Grabbed a cup and was planning to turn over the engine and see if it pumped. But the minute I removed the tube from the carb, gas came pouring out and didn't stop until I closed the fuel shut off. Its not really a gravity feed situation so the pump may be allowing too much gas thru. Sound reasonable? Ps thanks for any help
@SkylarHillShop
@SkylarHillShop 2 жыл бұрын
The needle and seat in the carburetor should regulate how much flow it's receiving. You can try cleaning those. Also sometimes floats leak and start taking on fuel which causes over fueling as well. This is also assuming the needle valves are adjusted correctly...
@richardbiemiller1447
@richardbiemiller1447 2 жыл бұрын
I have the same problem as a few others-no suction at impulse line. Hose is brand new, no obstruction, still no suction. Would a bad breather seperator cause this? Any other ideas?
@SkylarHillShop
@SkylarHillShop 2 жыл бұрын
Suction is created by the movement of the piston in a tightly sealed engine. Possible causesof no suction: broken connecting rod, bent or misadjusted valves, blown head gasket.
@richardbiemiller1447
@richardbiemiller1447 2 жыл бұрын
@@SkylarHillShop Thanks, but it runs fine with no exhaust smoke as long as I keep pouring gas or cleaner directly into the bowl. I don't think it would do that with any of those problems. Would a bad breather seperator cause the problem? Thanks again.
@12namleht
@12namleht Жыл бұрын
what if you have no vacuum at the impulse
@georgestrickland9278
@georgestrickland9278 Жыл бұрын
is there a difference in these pumps as far as the hp rating of the engine,some pumps advertise a different pump for over 20 hp engines
@SkylarHillShop
@SkylarHillShop Жыл бұрын
I honestly have no idea
@ernestbaker530
@ernestbaker530 2 жыл бұрын
What would cause the fuel to get into my oil on my toro mower
@SkylarHillShop
@SkylarHillShop 2 жыл бұрын
That's usually either cause by fuel leaking past the needle and seat in the carburetor. Or it could be a bad fuel pump. If there is gas in the impulse line the diaphragm in the pump is torn.
@helmedon
@helmedon 3 жыл бұрын
On mine the pulse line is directly from the valve cover to the fuel pump. Not getting flow from outlet hose. Brand new pump and pulse hose. Brand new fuel filter. Any ideas?
@SkylarHillShop
@SkylarHillShop 3 жыл бұрын
There could be an obstruction in the fuel tank. I've seen that before. They can look like a bad pump because the pump is just sucking the junk up against the end of the fuel line in the tank and can't pull any fuel.
@helmedon
@helmedon 3 жыл бұрын
@@SkylarHillShop Fuel tank is fine. I get good flow from the tank to the pump.
@SkylarHillShop
@SkylarHillShop 3 жыл бұрын
And you can feel a pulse if you put your finger over the end of the impulse line?
@mwa1252
@mwa1252 Жыл бұрын
What if the impulse suction feels weak? Definitly have pulse but feels very weak. Pulled off suction line and inspected for cracks, also made sure clamps were on tight. I don't know how much suction there should be but it feels weak to my amateur finger :)
@SkylarHillShop
@SkylarHillShop Жыл бұрын
If you can feel it, its enough.
@mwa1252
@mwa1252 Жыл бұрын
@@SkylarHillShop Thank you! That helps tremendously! Since gas is not flowing out from the fuel pump, now I can focus ON that fuel pump.
@cooperearhart2607
@cooperearhart2607 7 ай бұрын
What do I do if there is no pressure coming from the impulse line? That's my problem and I don't know how to fix it
@SkylarHillShop
@SkylarHillShop 7 ай бұрын
Is the impulse line in good shape? No holes or cracks, and it fits snugly on the fitting on the motor
@MrBrosovich
@MrBrosovich 2 жыл бұрын
what if you get no vacuum to the fuel pump? how do you repair the vacuum pump in the motor.
@SkylarHillShop
@SkylarHillShop 2 жыл бұрын
Check to see if the vacuum hose is plugged. There is no vacuum pump. The pulse is created by the piston moving up and down in the cylinder.
@stephennickles7389
@stephennickles7389 2 жыл бұрын
Thanks
@mobileempire5522
@mobileempire5522 2 жыл бұрын
I have a Honda eu2000i generator It's not getting fuel My fuel line is good and tight My vacuum line is good and tight My fuel pump is good There's fuel in my tank and fuel line is good free and clear. My compression is really strong I don't feel no pulse at the vacuum line out of all the times I tried to start it. Well felt it once but very weak.
@kristianperryadams
@kristianperryadams 4 жыл бұрын
What would you do if there's no pressure on the impulse line?
@SkylarHillShop
@SkylarHillShop 4 жыл бұрын
As long as the line is connected to the engine it will have "pressure". It's not going to be a steady flow of air just short little impulses every time the piston goes up and down. I suppose the line could be plugged somehow.
@richardwomack9196
@richardwomack9196 3 жыл бұрын
So what happens to the suction if a valve is stuck?
@SkylarHillShop
@SkylarHillShop 3 жыл бұрын
It would have no effect. The impulse of air is created by pressure in the crankcase. If you're connecting rod broke then you would have no impulse on the line. But at that point you've got a lot bigger issues than a bad fuel pump.
@kristianperryadams
@kristianperryadams 3 жыл бұрын
@@SkylarHillShop There was a tiny piece of what appears to be silicon or sealant that got flushed out with a good blast of carb cleaner, good shout on the plugging suggestion 👍
@SkylarHillShop
@SkylarHillShop 3 жыл бұрын
Glad you got it figured out!
@cactusstudiossouth
@cactusstudiossouth Жыл бұрын
So Simple!
@SkylarHillShop
@SkylarHillShop Жыл бұрын
Pretty easy once you understand how it works.
@korsu1234
@korsu1234 Жыл бұрын
What if there is no impulsion suck.?and pump is working😮
@emptech
@emptech Жыл бұрын
It's a great video, but...... KZfaq shows a photo of a different fuel pump than what you are showing in the video. I'm working on some equipment that uses the impulse pump, not the metal one you are working on but the plastic one. My problem is I removed it from a John Deere Gator and didn't take photos of what the three ports go to, and the hose lengths didn't give me a hint either. I'm just whining. Jim
@user-wq2ob9wj1t
@user-wq2ob9wj1t Жыл бұрын
why dont you use a fule pressure gague on it to check pressure
@SkylarHillShop
@SkylarHillShop Жыл бұрын
I suppose that would work, i've just always done it this way.
@matthewjay6736
@matthewjay6736 Жыл бұрын
I have a 690. No pulse at pulse line. Tons of pulse at crank vent, dipstick and oil fill cap. Can't even force air thru the line. We are lost.
@SkylarHillShop
@SkylarHillShop Жыл бұрын
Replac the line, must be plugged. See what happens
@matthewjay6736
@matthewjay6736 Жыл бұрын
@@SkylarHillShop line has been removed and air directly applied to pulse tube fitting. And vaccum drawn.
@SkylarHillShop
@SkylarHillShop Жыл бұрын
The pump does not work off vacuum. it needs the pulse from the crankcase to push the diaphragm in the pump and release it repeatedly
@markmark8866
@markmark8866 2 жыл бұрын
The one for my Yamaha mx825 is 80 bucks, it’s on a gravely mower
@bradleyhager5756
@bradleyhager5756 2 жыл бұрын
That mower looks like a pain to work on. Very crammed engine bay
@joelopez8103
@joelopez8103 2 жыл бұрын
You forgot to tell folks to check the feed to the fuel pump. If the line from the tank to the pump has obstruction like a plugged filter the pump is not going to pump.
@SkylarHillShop
@SkylarHillShop 2 жыл бұрын
Good catch! Thanks for the reminder
@therealbikerman
@therealbikerman Жыл бұрын
But what if it doesn't have any impulse then what
@MCMinerHQ
@MCMinerHQ Ай бұрын
Then you probably got bad compression
@darinbarfield8738
@darinbarfield8738 3 жыл бұрын
Can’t hear a word you are saying??? Volume isn’t good.
@Elityndall_3
@Elityndall_3 Жыл бұрын
Now what if there is no impulse
@SkylarHillShop
@SkylarHillShop Жыл бұрын
Is the line plugged, or damaged?
@Elityndall_3
@Elityndall_3 Жыл бұрын
@@SkylarHillShop nope
@jayjernigan6485
@jayjernigan6485 3 жыл бұрын
You didn't take into account that you might have a plugged fuel line.
@SkylarHillShop
@SkylarHillShop 3 жыл бұрын
I did mention having fuel to the pump. But it was in passing. I should have made that point more clearly. Thanks for clarifying!
@markjohnson7508
@markjohnson7508 2 жыл бұрын
Yea you get the junk that comes outta China you'll be sorry. Get oem. Its really the only sure thing. China is good at making cheap low cost items but things like this cannot be substituted. Believe me from plenty experience
@jeffreysnethen9586
@jeffreysnethen9586 Жыл бұрын
can you bypass the part & run the fuel line straight?
@SkylarHillShop
@SkylarHillShop Жыл бұрын
No, the only way you could run without one is if the fuel tank is higher than the carburetor.
@jeffreysnethen9586
@jeffreysnethen9586 Жыл бұрын
@@SkylarHillShop thanks, thinking about doing that with my generac generator fuel tank is above, goes through that part a lot in storage it always dries out
@wanderingquestions7501
@wanderingquestions7501 Ай бұрын
Thanks
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