My nephews truck died on sat he found that the lift pump had failed replaced that . Told him how to make sure VP had fuel and to crack injector lines to make sure he had fuel there.They still could not get it s to start. Thinking VP went out, anyway to test further to make sure it is that?

 

I just went through this and luckily mine was just air in the lines. I cracked #1 and fuel was just dripping out and then I cracked #3 (along with #1) and within a few seconds I was taking a diesel bath, and boy was I glad. I believe there should be 80psi coming from the IP so it ought to make a huge mess. He can also crack the fuel line at the IP coming from the filter housing and make sure its making it that far.

 

I have had this problem several times myself. Sounds like you gave him some tips, so excuse me if I'm repeating what you told him.

First make sure the lift pump is running, then trace the fuel flow all the way to the injection pump. Crack fittings as necessary to verify the presence of fuel at each connection. I start at the injection pump and if its dry work my way back to the lift pump. Once you are convinced its pumping fuel to the injection pump tighten everything back up and crack 2 or 3 fittings at the injectors on the head. Again look for fuel leaking at the loosened fittings while cranking the engine. If you dont have fuel at this point check for codes. A faulty timing sensor for example will keep the fuel solenoid at the injection pump from opening and you won't see any fuel at the fittings on the head.

I have also had trouble with the ECU not energizing the lift pump when it should. That is why I mentioned making sure that it is running. I have seen it supply voltage less than 12, as low as 5 or 6 so the pump barely runs. You could temporarliy run a wire to the pump just to get the truck running, then chase down the ECU problem. I finally installed an Air Dog system that has a relay between the ECU and the AD pump and the problem is gone. HTH

 

They had fuel to the injectors it did not spray out when the nuts were loosened they had to loosen the clamps and move the lines a little to get fuel out.

 

Did it finally get fuel?

 

Any codes?