As has been said, check the intercooler. Pull the hoses and plug one end and make up a fitting to clamp in the other end with a valve and a pressure gauge. Air it up to about 30 psi and close the valve. If it loses more than 5 psi in 15 seconds, it's FUBAR. For your problem it would have to have a substantial leak so it should pretty much go to zero as soon as you close the valve.
How much fuel pressure? No fuel, no boost, no power.
According to this article, 25 psi is minimum.
Some good info for both P pump and VE.
https://www.dieseltuff.com/instructions/Kevin
