Lift pump?

[Konstantin]

(01-29-2019 )Rawze Wrote:  

(01-29-2019 )Konstantin Wrote:  Yesterday I put ignition ON , I hear noise from lift pump working and i pressed with a nail on Compucheck fitting in top right corner of fuel pump. I was expecting some fuel to leak out, but nothing happened. Now i am sure the lift pump is defective. Is it possible to prime the engine with broken fuel pump? the engine is not starting now.

CM871 engine ...

when my lift pump is running, truck not started yet, and I press in on that compucheck fitting at the top right of the gear pump, fuel comes blasting out at me with a high force, and gets all over everything.

Just stating this for reference.

Also, if someone monitors the fuel pressure in insite while cranking, it has to be more than 50 psi or the truck will not start. As a reference, most trucks will show 70-100+ psi when cranking and everything is ok.

Thank you for your help! Somebody told me that I have to crank engine and press another Compucheck fitting at end of the pump and let air out. That is how I started truck today. But it was a mess of diesel leaking all over. When I have time I will replace lift pump for sure.