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Originally Posted by westside95351
the car looks like the fuel pressure regulator was messed with before(it is a different style regulator than most of the other 3.3s at the junk yard) and the rubber hose has been replaced.
also after the car fires up and tries to run for a few seconds at the most... the fuel pressure valve has low pressure(but once primed it goes up again).
could this be a sign of a bad FPR?
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when you prime it, the pressure goes up nice... when you start it, manifold vaccume opens the regulator allowing fuel to return... the stalling and popping in the manifold could be a regulator problem, since the diaphram in the regulator might be punctured, allowing for to much fuel to leave the rail and some to enter the intake manifold creating backfire. Take the hose off of the regulator and inspect it.