Engine/Transmission (1998.5 - 2002) Lift pump will not shut off

[azpete]

The other day I replaced my fuel pressure gauge and sending unit. The motor started and then died, air in the line. Cycled the pump and it kept running for almost a minute so I turned the ignition switch off but the pump kept on running. After a couple of tries the truck started and no problems. Shoudn't the pump stop when the ignition is turned off?



Changed the fuel filter today and the same thing happed. Bump the starter and the pump just kept on running after turning off the ignition. Unless my feable brain has gotten worse I thought the pump would shut off with the switch in off possition.



After a couple tries the truck started and no other problems. Just wondering if I had an air leak in the fuel line the lift pump would run forever without the key in. I do have the Geno's relocation kit and all the wiring and connectors look ok.

 

[Fishin Guide]

The factory system will keep the pump running after the key is shut off.



Does the pump NEVER shut off? Or does it run for 20 - 30 seconds after teh key is off? If it's the later, then that's nothing to worry about.



If you bump the key, the pump will run for approximately 30 seconds. If the truck didn't start, I suspect this is what you are hearing.



If the lift pump does not shut off, it can be a few other things. First off, I am not familiar with that relocation kit, but if it uses a relay, it is possibly for the relay to fail in teh "on" position. I have had that issue with my backup lights prior to moving the relay up out of the weather. The contacts corrode and it won't shut off.



Dave

 

[D-White]

I had the same problem and replaced the fuel relay for $11. 00 from dodge