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I by passed the original lift pump on my 2001 HR Ambassador with a 5.9 cummins about a year ago with the air dog unit. I am heading to florida and stopped for the night and noticed the old lift pump is leaking diesel fuel. When I installed the air dog I by passed the old unit and left it in place and just capped it off. Not sure how fuel is getting into the unit unless the electric pump is causing the fuel going back to the fuel tank to back feed to it. I just had a hip replacement 2 weeks ago and not sure if I can get down inside the engine bay and try to tighten the bolts to the pump a little. Now the leak is just a few drops ever now and then, I like to know how bad can this leak get and does anyone have a picture of the pump to help me locate where the bolts that hold the pump on is located. I looked in the engine bay and can see the pump but now much else. Thanks for any help. 

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Thanks for the info and picture. I'm going to try and get a better look at the pump in the morning. I was thinking it was the original gasket for the pump. I know they has a history of problems, but I've never worked on one.  I'm hoping a little tightening will stop the leak. 

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  • 1 month later...

As OhReally wrote, check around the banjo fittings and there may be a plug fitting opposite of the return line. Make sure that's not leaking. The lift pump side is isolated from the return side on my original lift pump (took the old one apart after it was replaced once) and there wasn't a way for the fuel to crossover.

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