When I get my machine in a nose down condition I believe the fuel outlet at the tank is sucking air which results in low power and stalling. Is there a device I can install which will burp the air out of the fuel line to the injector pump? Any recommendations?
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Need air eliminator for diesel
- Thread starter jimpad
- Start date
Tinkerer
Senior Member
What kind of machine is it ?
That shouldn't happen unless it is very low on fuel in tank.
That shouldn't happen unless it is very low on fuel in tank.
hosspuller
Senior Member
Don't patch a problem... figure out what the problem is ... I had a diesel that would spit & sputter depending on machine position too. Root cause was a leaking fuel pick up hose in the tank. It would suck air. Replaced hose, problem fixed.
Tinkerer
Senior Member
Are you sure it is an air problem ? Or is there something sliding around in the fuel tank. I have seen everything from rags to weeds in fuel tanks.
alrman
Senior Member
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Have you inspected the fuel filters?
Is there an in-line fuel filter before the lift/primer pump?
Check the fuel line between the lift/primer pump for fuel flow / blockage - & clear it by blowing compressed air down it, back into the tank.
Is there an in-line fuel filter before the lift/primer pump?
Check the fuel line between the lift/primer pump for fuel flow / blockage - & clear it by blowing compressed air down it, back into the tank.
Yes. Changed both filters, cleaned separator, cleaned banjo fittings. I've blown out the suction line before with mixed results. Thing is it comes and goes. Seems to do it less when cold. Almost always does it when nose down but today even on the flat. I think I'll flip separator upside down and see if air actually accumulates. Pretty sure dropping/inspecting the tank is a big job.
catman13
Senior Member
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do you have any rubber hoses from the tank to the injection pump, i have had and seen hoses start breaking down inside and cause this problem
heymccall
Senior Member
You need to pull out the tank outlet, after draining the tank. Had to it on all my Takeuchi CTLs.
I'll be back with the thread link...
I'll be back with the thread link...
heymccall
Senior Member
13th post down...whole thread worth reading
https://www.heavyequipmentforums.com/threads/takeuchi-tl140-fuel-problem.68053/#post-707499
https://www.heavyequipmentforums.com/threads/takeuchi-tl140-fuel-problem.68053/#post-707499
I'm baaaaaaack! Downhill fuel problem persists!. I stuck the machine in a hole and it stalled. Fuel tank was probably about a quarter full. Disconnected fuel pump outlet and it was sputtering but not really pumping. Dumped separator and pump would not re fill separator. Filled fuel tank full and separator filled and machine ran fine. I think that port at the back of the tank that is piped to the "To Injection Pump (Out)" is getting exposed to air when front down machine position and that is what's causing the problem. What is the purpose of this line... should there be a check valve in it?
X is just a filler neck vent. It's small to get you to shut off with a small amount of air left, then it will equalize to keep from burping fuel out the filler neck.
"to injection pump (out)" would only have a check valve at the injection pump, it shouldn't cause stalling while running. I'd focus on the supply line in the tank, or a vacuum leak between the tank and injection pump, or a floater in the tank that stays safely out of the way when the tank is full. Key to that was if the pump was pumping air and sputtering fuel when it wouldn't pump, or if it was pumping nothing. Foam bubbles is an easy way to tell if it's pumping air, remember the air volume will be much less than fuel volume out of any fuel pump, they're not good at it.
"to injection pump (out)" would only have a check valve at the injection pump, it shouldn't cause stalling while running. I'd focus on the supply line in the tank, or a vacuum leak between the tank and injection pump, or a floater in the tank that stays safely out of the way when the tank is full. Key to that was if the pump was pumping air and sputtering fuel when it wouldn't pump, or if it was pumping nothing. Foam bubbles is an easy way to tell if it's pumping air, remember the air volume will be much less than fuel volume out of any fuel pump, they're not good at it.
funwithfuel
Senior Member
I've been reading this "new to me " thread, i would strongly recommend replacing the fuel hose from the tank to the separator and from the separator to the lift pump. If you can find hose similar to parker push-loc, all the better. You want to stay away from natural rubber products. As mentioned earlier, Catman13, the rubber breaks down. The challenge is, you'll never see a leak. You either replace with known good hose or always have that as an unknown variable. Good luck.