i have a 93 cummins and every time i go to start it i have to bleed it, but then runs perfect after. its like fuel is running back into the tank when i let it sit for more than 10 minutes. what holds the prime in the fuel lines???

 

You probably have a small leak in line letting air in, they often will leak air in without leaking fuel out.

 

thats what my first thought was...but i went ant rtv'd every single spot where there could possibly be a leak from the tank to the lift pump and made sure every line bolt and fitting was tight... it just seems to me the fuel is just draining back to the tank. i went and tried to prime it manually at the lift pump and the pump ran out of fuel and there wasnt anything left to pump...

 

I run a check valve just upstream from the VP inlet to avoid this type problem.

 

i had a leak at my fuel filter housing at the return, which was causing a similiar problem but it was more of an overnight time frame issue.

 

RTV'd fuel lines

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Good to see a member from the past return

 

Can't the lift pumps allow fuel to bleed back

 

It could but the rtv fuel line thing is gheto!!! 86 that ****!! new hose and clamps!!!

 

You guys need to go back to the books. Let it sit for a while, don't try n fire it up n see if there's any prime at the LP the diaghram in them often goes bad n will drain fuel back to the tank.

 

Try bumping the engine a bit to make sure the pump lever is up on the cam.
That's what these forums are for - people who don't have the necessary books and/or experience. Not jackwagon know-it-alls.