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How To Diagnose An Impulse Fuel Pump
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- čas přidán 11. 04. 2020
- 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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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!!
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.
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
It was just as I suspected. Your video confirmed it for me. Thanks for sharing it with us on CZcams.
Cool, aXe, I missed it. Very informative, straight to the point. Thanks.
Never knew what an impulse fuel pump was or how to test it. Thanks a bunch.
Thanks for the info, I looked at 4 other video's before I found you. your instructions are good.
Thanks again.
You're welcome, have a great weekend!! Thanks for watching
Informative and straight forward. Love it.
Well Done. Simple, Direct and Straightforward; Liked & Subscribed. Thank You John 14:6
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
Hey that's a great tip aXe!! Have a good day my friend!
Thanks, aXe; excellent video. Now I know how to troubleshoot an impulse fuel pump.
Good video, straight to the point
You deserve more views on this.
Great vid helped with troubleshooting. Thanks!
Very good video. What does it mean if you have a weak or no pulse coming from the crankcase hose?
I'd like to know the same thing
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.
Might of checked the fuel supply line to make sure fuel from the tank wasn’t obstructed.
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.
Thanks for posting this!
You're Welcome!!
Great vid thank you. Helped have a better idea on my ezgo golf cart.
Nice work
Thanks, have a great weekend!
Thanks for information just what I need
Great job on your video sir.
Thanks a bunch.
You're welcome, have a great weekend!
Very much appreciated. Thank you for sharing this.
Thank you definitely helped going to buy a new fuel pump now
You’re a legend. Thank you!
You're welcome, have a great week!
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.
how do you fix no impulse to the hose
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
Very helpful sir
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.
What did you find out? My cub just started doing this.
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 ?
I wouldn't. It doesn't need anything to lube or soften the diaphram.
check one with a gauge and see what kind of pressure reading you get
compare a new one to a old one
Thanks
Great Video Man Thx ,,,Probably its just dirty from seating there, try to clean it first
Excellent video!
Thanks!
Very helpful thanks
Great job 👏
How much fuel pressure is generated by a Mikuni pulse pump? Where can I find specs?
Man thanks bro!
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
Is the impulse line in good shape? No holes or cracks, and it fits snugly on the fitting on the motor
What would you do if there's no pressure on the impulse line?
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.
So what happens to the suction if a valve is stuck?
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.
@@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 👍
Glad you got it figured out!
Outstanding
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.?
The Briggs probably didn't have one because the tank was high enough it would gravity flow.
Thanks good info
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 :)
If you can feel it, its enough.
@@SkylarHillShop Thank you! That helps tremendously! Since gas is not flowing out from the fuel pump, now I can focus ON that fuel pump.
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
I honestly have no idea
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.
Fantastic, thank you
You're welcome!
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?
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.
@@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.
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.
What symptoms are you having is it leaving a puddle of gas engine is off, does it run too rich?
@@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
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...
what if you have no vacuum at the impulse
What would cause the fuel to get into my oil on my toro mower
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.
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?
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.
@@SkylarHillShop Fuel tank is fine. I get good flow from the tank to the pump.
And you can feel a pulse if you put your finger over the end of the impulse line?
what if you get no vacuum to the fuel pump? how do you repair the vacuum pump in the motor.
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.
It's a great video, but...... CZcams 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
What if there is no impulsion suck.?and pump is working😮
So Simple!
Pretty easy once you understand how it works.
That mower looks like a pain to work on. Very crammed engine bay
why dont you use a fule pressure gague on it to check pressure
I suppose that would work, i've just always done it this way.
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.
Replac the line, must be plugged. See what happens
@@SkylarHillShop line has been removed and air directly applied to pulse tube fitting. And vaccum drawn.
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
The one for my Yamaha mx825 is 80 bucks, it’s on a gravely mower
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.
Good catch! Thanks for the reminder
But what if it doesn't have any impulse then what
Then you probably got bad compression
You didn't take into account that you might have a plugged fuel line.
I did mention having fuel to the pump. But it was in passing. I should have made that point more clearly. Thanks for clarifying!
Now what if there is no impulse
Is the line plugged, or damaged?
@@SkylarHillShop nope
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
Can’t hear a word you are saying???
Volume isn’t good.
can you bypass the part & run the fuel line straight?
No, the only way you could run without one is if the fuel tank is higher than the carburetor.
@@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
Thanks