Engine/Transmission (1998.5 - 2002) Another Lift Pump Nightmare

[Steve St.Laurent]

Chuck, many of us are running that setup. I have a 7 psi 100 gph Carter pump back at the tank in series with the stock Carter on the engine. You can read about my setup at https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=19767 . I had gone through 4 lift pumps in 65,000 miles and none of them could maintain above 4 psi at WOT even when brand new. I now have 110,000 miles on the truck and haven't replaced another lift pump (45,000 miles and close to 1. 5 years) and I haven't lost any fuel pressure from when I first put the setup on.

 

[Ray Torresdal]

lift pump on school buses

I just saw a lift pump off a FL65 school bus last evening. It had a check ball just inside the intake fitting. The check ball had worn a hole through the metal screen that was keeping it out of the pump impellers, wallowed the hole where fuel flows into the impeller section, and then wore notches in the impeller fins, and also in the impeller body.



When we looked at the new pump I carry as a spare, there was no check ball in it. I'm assuming the check ball is because the FL65 fuel tank is behind the rear axle of the bus!!! That, my friends, is a long way to suck fuel.



Other than the check ball, the pump appeared to be identical to what is on the Dodge.



Ray



PS: When taken to Cummins, they replaced the injection pump which had failed, but never checked lift pump pressure!