Problems With SN95 5.0L.... Please Help

[blackEagle]

Originally Posted by BowTie Eater 5 Liter

i checked fuel pressure today, at an idle it sits at about 30 or so, but if i give it any gas, it jumps up(didnt see it hit 40psi though, which is what i thought they were supposed to sit at).
when i just turn the key on without starting the truck, it jumps up almost to 35, then slowly drops, but fast eanough you can watch it dop down.

what could this be? could it be the source of some of my problems?

i ran the motor, and reved it a little and POP from the intake, like a manifold backfire from a carburated engine. i pulled various spark plug wires while it was running and noticed little to no change in the way it ran, which has me really stumped.

does this sound like my timing?

I'm no expert but, I think your fuel pressure is too low. Stock is supposed to be 38psi at idle. You may have a bad fuel pump or regulator.

You should get this taken care of first before doing anything else. Low FP is just like leaning out the motor. NOT a good thing.

[BowTie Eater 5 Liter]

fuel pressure is about 30 at idle.

when i shut it off, the fuel pressure drops fast, i clamped off the return line with a pair of vise grips, cycled the key(it showed 49psi) 2 hours later it was over 35 still, i didnt pinch the line too hard, as i didnt want to damage it, but when i unclamped it, the fuel pressure dropped fast eanough to watch it move on the gauge.
tomorrow i will replace the regulator(should i buy a stock one or is it worth it to get an aftermarket one for a stock motor?) and if that doesnt do it, ive got a spare fuel pump.