Im leaning towards the check valve being bad in the lift pump

 

your silly, your building adiquite pressure. dont ya think if something like that was going onn you wouldnt have diddly for pressure. LOL cap and pressurize the lines and find the air leak.

 

Missing something somewhere in the mix here .....

Do you have or have you seen a fuel leak anywhere on your engine ?

 

No leaks anywhere

 

How did you plumb your big line kit? I don't think it's your check valve because you said once you shut your truck off then fire it up again it takes awhile to get it fired up. I can't see how fuel from your p pump to your lift pump drain back within few sec...and also pressure may seem good but what about flow? is it restricted? Lift pump might be shot. Or you got air in the system. Hope this make sense

 

This is such a mess. Pressurize the tank or use a smoke machine. If not leaks on suction side outside of tank then most likely the pickup is cracked. What about the elbow at the fuel pump is it good?

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The pick up is brand new. And yes the elbow is good.

 

Even new pars have faults occasionally.... Just sayin ...

 

ya but its been veiwed a million times. its nearly viral. LOL

take the sending unit out of the tank. keep ALL the lines connected. cap the line at the pick-up to lift pump connection and put a few PSI of compressed air to it. this is where you will get air into the system that will F$$$ with you. (the suction side of the system.) you will see no visable signs of a leak while operating the truck. all other sections of fuel line will pysically leak fuel because they are under some kind of pressure. if you have no leak after the test. take your injection pump off because something is going on.

fuel and air is all a diesel needs. if your getting air to the cylinders and unmolested fuel to the pump than its the fuel delivery piece by default.

 

Good call