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Old 05-10-2013, 07:48 PM   #1
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weak lift pump?

When i reconfigured my fuel system i added about 15' between the tanks and engine. After chasing all my leaks i still can't keep the engine running for more than a few minutes. I can use my primer bulb to pump up pressure and the engine will restart without having to bleed the system.

I think the engine lift pump may be marginal. It's a 30 yr old lehman.

Any other ideas?
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Old 05-10-2013, 08:13 PM   #2
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I'd call Bob or Brian Smith at American Diesel. They, particulary Bob, know more about the FL120 than anyone and may be able to diagnose your problem over the phone. The lift pump could certainly be the culprit but there are other potential causes, too, one or more tiny air leaks being one of them.
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Old 05-11-2013, 08:07 AM   #3
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New lift pumps are cheap. Plus American Diesel will have a kit that includes a new rubber hose feeding the pump. Mine was old and most likely collapsing and shutting off the fuel after a few hours of running. I say most likely because I didn't troubleshoot for that I just replaced both per AD's recommendation.
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Old 05-13-2013, 07:12 PM   #4
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I talked to Brian at ad. He said the pump can pull the extra hose length. I pulled the lift pump so i could make sure it was ok. It looked like 2 of the 6 screws that hold it together were loose. I opened it up and it all looked ok. I put it back together and the engine runs without any issues. Go figure.
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Old 05-13-2013, 07:20 PM   #5
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Unless things have changed, the rebuild kits for the FL120s lift pump are no longer available. New complete pumps were/are, but not the rebuild kits. So said Bob Smith at American Diesel when I tried to order a couple of rebuild kits a number of years ago. Has the situation changed and rebuild kits are avaialble again?
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Old 05-13-2013, 07:28 PM   #6
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I didn't ask.
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