Q: what shuld my fuel pressure be for my 2004 4.3 chevy express van on 2004 Chevrolet Express 1500

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i am wondering if my problem is the fuel pump or my fuel pressure regulater, i am trouble shooting to find the problem
(1) Answer
it should be 62 lbs very critical. if you have below 60 you will have drivability issues.
if you want to check the regulator clamp off the return and watch the pressure after the motor is shut off. if it drops, it could be the regualtor or a leaking injector. if not then release the clamp and if the pressure drops, then it is the check valve in the pump.