Does lift pump work on 2008 Dodge Cummins with key on or does it have to be turned t

[GardnerM]

I have tank clean put pump back into tank bolted up tank, left lines unhooked and turned key to on with nothing happening . I dumped 10 gallons back in. I thought pump works with ign . On or does it have to go to start?

 

[Hoefler]

Will run for approx. 3-5 seconds and shut off, runs while cranking and with engine running. Cycle the key several times to get fuel to the engine.

 

[mwilson]

Bump the starter and then leave key on. You will hear the pump run for several seconds. Then turn key to off and then bump starter again. Repeat as needed.

 

[GardnerM]

Ok ,Ill try it again . I tried like five starter bumps and left on run ,and expected to hear a splatter . No drips or...yet. I may have killed it pounding the metal lock ring . Fought it for a whole day, and finally just made a thick bead of black rtv silicone and put it back in. Napa has one on the way ( lift pump) ,won't make it till Wednesday. Also sent for an FCA from Genos in case it wasn't a weak lift pump. So miss my first Gen

 

[GardnerM]

Kept repeating and now it is dripping down back there . Not running like I would expect a fuel pump to do ,just dripping. Maybe it needs pressure to keep it pumping.