Leaky lift pump
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Junior User
Joined: Jan 2004
Posts: 52
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From: Spokane, WA
Leaky lift pump
I have an 86 6.9 that has been getting the bugs worked out of it. In the mornings, even when not too cold, the truck is fairly hard starting (takes cranking for several seconds) - so it looks like air is leaking in.
After driving for 30 minutes or so I can often smell diesel. When the engine is running for even a short time, I can see fuel on the bottom of the lift pump. When it gets to the point that I can smell the fuel, I can see fuel being blown up onto the vacuum pump.
The truck has 120K miles on it (unless the previous owner did a real good job of fudging his records). Is the problem likely the pump, the gasket, or the lines? Is this a common problem? Thanks, Steve
After driving for 30 minutes or so I can often smell diesel. When the engine is running for even a short time, I can see fuel on the bottom of the lift pump. When it gets to the point that I can smell the fuel, I can see fuel being blown up onto the vacuum pump.
The truck has 120K miles on it (unless the previous owner did a real good job of fudging his records). Is the problem likely the pump, the gasket, or the lines? Is this a common problem? Thanks, Steve
New User
Joined: Nov 2006
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fuel leak
steve in regard to prob, if line is it look at discharge [fuel heater] as my experience was a cracked flare at outlet. suction from water sep is tight or lift pump wouldnt pull fuel as air is easier. gasket keeps eng. lube from leaking but does not keep fuel from entering eng. ie bad pump [diaphram] i "quick guessed" the prob bought new pump installed and didnt fix .now i have a spare .made a new line out of 3/8 copper eliminating heater as in so fla it isnt necc oh yea use a double flare tool, if you are in a warm climate regards butch
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
For the price a new lift pump changing it would be wise, you would then have all the fittings and lines removed to check them out at the same time. Consider replacing the rubber hose to the lift pump too, ensure there is a large enough curl so as not to crimp the hose.
Thread Starter
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Junior User
Joined: Jan 2004
Posts: 52
Likes: 0
From: Spokane, WA
I replaced the 3/8" rubber fuel line that goes from the metal line from the tank to the inlet of the lift pump. The old line was really hardened and didn't look like it sealed up on the fittings very well.
That solved the leaking problem.
That solved the leaking problem.
