sumnerslayer

OK so I've been chasing a load up problem, after going thru my coils, wires and plugs I figured I better check fuel pressure, went down to a buddy's shop, hookup up a gauge and primed the pump.....95 psi!! Started the car and it dropped slightly, rev the car and it drops slightly. Even tried 2 different gauges. Running a stock LS1 pump and a Corvette style filter/ regulator, help!!

sumnerslayer

Not one reply? I installed a new Vette filter/ regulator and still pushing 85-90 psi, I blew air into the tank thru the return line, there was some resistance but it took air, how free flowing should it be? How does the return in the pump work?

S10xGN

iTrader: (11)

Pretty sure the return line should be free-flowing. You could always pull it off the regulator and run it to an open bucket and see if the pressure comes back to normal...

sumnerslayer

Might give that a shot tomorrow but at this point I'm pretty convinced the problem is in the pump, I have a hard time believing the line is plugged or kinked, system isn't that old and problem just randomly occurred, I really don't wanna drop the tank because of the new exhaust, (all 1 piece pipes) so I guess I'll have to put in a trap door

stevieturbo

The problem will not be the pump.

Draw a schematic of exactly how you have the system configured.

Sounds like either a blocked return, or you have plumbed the regulator wrong ( or if it is adjustable, adjusted it wrong )

or finally a faulty reg.

ss1

iTrader: (32)

Stock LS1 pump you say? Did you remove the stock regulator from the return?

sumnerslayer

Stock LS1 pump, a 3/8 feed line coming into the Vette filter/ regulator, a 3/8 going back to the pump hooked to the port marked "R". I know the plumbing is right because I didn't not have high pressure before this issue, the pump has a regulator built in, it is still in there, I've read if that fails its cheaper to just replace the whole pump assembly, I know the pump is fine, its obviously pumping fuel lol

Lonnies Performance

iTrader: (16)

Did you remove the internal regulator in the factory fuel module? If not you are trying to run it through 2 regulators.

sumnerslayer

Removed the internal one last night, I haven't had a chance to test pressure yet, chance my inline one is damaged now with seeing 90psi for a bit?

Lonnies Performance

iTrader: (16)

It's probably OK.

sumnerslayer

Threw a gauge on it yesterday and now its sitting at about 60-62 psi which I believe is acceptable, thanks for the replays guys!