im almost done with the swap, im just trying to figure out what is wrong with the motor and why its running weak

So im messing with a few things and decided i was going to see what happened if i pulled the fuel pump relay
its a fuel pump designed for the SC 3800 and puts out 60lbs instead of 35lbs
so after i pulled the pump relay the car revs up and then idles really nicely until the pressure drops too much in the lines
what can i do to fix this?
I dont have my fuel return line hooked up, would this fix the issue?
anything else someone might have to help me out its appreciated

what the hell.... you dont have the return hooked up? How is it working at all, and what are you talking about with this "supercharger pump" putting out 60psi? A fuel pump is a fuel pump, they are rated in flow not pressure.

well i blocked off the return due to a rotten return line, and planned on hooking it back up but havent gotten around to it trying to trouble shoot this issue, i have had plenty of cars that run fine with the return blocked off. Im about 60% done with bending the new tubing and setting everything up but need to run to the parts store and grab some more fuel line. will keep post updated.

The return is there for a reason. If you block it, you will eventually toast the pump and maybe the engine.

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87GT - 3800SC Series III engine, 3.4" Pulley Flotech Exhaust Autolite 104's 4T65eHD
87GT - 3.4L Turbocharged engine, modified TH125H
" I'M ON THE LOOSE WITHOUT THE JUICE "

blocked return = insane fuel pressure... simple as that.

^ I LOL'd.

Put a return on it please. How do you think the regulator is supposed to work without it?

return is on, car runs a bit better... but

the car starts and has a very high idle during this time i can rev the motor, after the idle levels out it seems to idle ok but i cant give it any gas or the motor will die out , if the motor does not die it will rev back up really bad then idle like normal.

also after the motor is warmed up it has a hard time starting and sometimes will not fire until i pull the fuel pump relay and crank it till it runs

your fuel pump should not even work at all without a relay, something is really screwed if you can even run the motor in anyway without it.

x2 on the LOL'ing

thats part of the issue, i shut off the fuel pump and the motor will run better until the fuel subsides.

not really sure what is going on

ruptured fuel regulator causing 80psi of fuel pressure is my guess.