super high fuel pressure is pissing me off

[draculia]

ok, i'm gonna keep things short and simple.

i'm getting 95psi

the regulator is fine, i've tried 3. 2 of the regulators are adjustable and brand new, yet the pressure doesn't fluctuate no matter how much i adjust.
the return line is not blocked
the return nipple on the tank is not blocked
the regulator bung on the fuel rail is not blocked

i'm completely out of ideas

[trent]

Re: super high fuel pressure is pissing me off

ok, i'm gonna keep things short and simple.

i'm getting 95psi

the regulator is fine, i've tried 3. 2 of the regulators are adjustable and brand new, yet the pressure doesn't fluctuate no matter how much i adjust.
the return line is not blocked
the return nipple on the tank is not blocked
the regulator bung on the fuel rail is not blocked

i'm completely out of ideas

I had the same problem on my 84 318. It was the regulator. Make sure you have the gauge on the right side of the rail or the reading won't change.

[draculia]

hahaha, don't worry, its on the right side

[draculia]

ok, update.

i'm thinking there's is a problem with the tank, not sure exactally what would be wrong with it though.

since i'm able to blow through the return line when it is disconnected from the tank, i know the return line is not blocked. i also poked in through the return nipple on the tank a good 2-3 inches, and that is not blocked.

with that being said, today i felt i would bypass the tank altogether. i ran a line from the regulator to a portable gas tank. i then started the car up, and wouldn't you know it, 38psi with the vac line attached. bravo, so i know i'm on the right track.

so i'm led back to the tank. what could possibly be wrong with it? with the return line connected to the tank, i get a hissing noise that i cannot track down. it is definately on the tank, possible higher up. i did not have this when i bypassed the tank.

could the vent be blocked? isn't there a transefer line from sump to sump? could this be blocked, and would that have such an effect?

well, soon i'm gonna be dropping the exhaust and driveshaft anyways, so it looks like i'll drop the tank as well.

the car runs great with the proper fuel pressure btw, so i'm happy with that :)

[DaN]

You followed the return line all the way from the regulator to the tank? to make sure there are no kinks?
Perhaps try and take the return off the pump and stick it in a can, then run it.
Then you'll know the problem is in the pump or tank.

[draculia]

huh? i don't think you read much of anything that i wrote.

since i'm able to blow through the return line when it is disconnected from the tank, i know the return line is not blocked.

with that being said, today i felt i would bypass the tank altogether. i ran a line from the regulator to a portable gas tank. i then started the car up, and wouldn't you know it, 38psi with the vac line attached.

i don't know why you would bring up the pump. that would only come into question if i was getting low or no flow.

next on my list is to check out the expansion tank and vent lines.