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zukdrvr
02-15-2007, 06:20 PM
i checked my fuel pressure the other day and it holds at about 1.5psi and doesnt change with more throttle, i'm not sure what its supposed to be but this number just seems low. btw i have a weber if it makes a difference.

Jr88fan
03-01-2007, 09:26 PM
I have about 3.5 Mine acts like it is starving for fuel. I really think I have Weber problems though.

hillbilly
03-01-2007, 09:31 PM
I think most that run Webers are at about 2-2.5 lb's of fuel pressurepopcornnOn Holley's and Qjets we run 7lb's

billsbar
03-01-2007, 10:01 PM
Chevy and fords run around 6 to 8. I've always run 8lb on regulators for electric pumps on imports. BUT I would have to look what my Zuk is running, but 1.5 seems real low.

zukdrvr
03-02-2007, 04:31 PM
any ideas as to what would make it be this low, my fuel pump is brand new and filter was just replaced?

jbzukin
03-02-2007, 07:58 PM
did you check it at idle?
if you rev the engine up does the pressure change?

zukdrvr
03-04-2007, 07:05 PM
it stayed at 1.5 when idleing and when i reved it up a little bit nothing changed

jbzukin
03-04-2007, 10:45 PM
I have an electric pump on my 1.6 swap. had a look through my manuals and can't find anything on what the pressure should be. they only list the injected fuel pressure but 1.5 seems really low.
any chance some of the lines got mixed up when you put the webber on?
just a shot in the dark....

Jr88fan
03-05-2007, 09:40 PM
I finally got my weber tuned right tonight, and it runs great. I have a regulator with 2 lbs on it (I believe).

ThreeEyedBandit
03-05-2007, 11:40 PM
I know on subaru hitachi's they like 1.5 to 2 PSI of fuel pressure to be the happiest. And affirmative on the weber 2.5 to 3 PSI. At least thats a starting point on the fuel pressure. And yes F.I. pressure will be quite bit higher.

Matt

zukdrvr
03-06-2007, 10:19 AM
when i installed my weber i removed the fuel return line off the pump and put one of those little caps over it, any chance this would affect my pressure?

ThreeEyedBandit
03-06-2007, 12:01 PM
Yes it would, but it would cause the fuel pressure to be high.

Matt

billsbar
03-06-2007, 12:40 PM
when i installed my weber i removed the fuel return line off the pump and put one of those little caps over it, any chance this would affect my pressure?


that pump was made to releese excess pressure back to the tank using that line. You may damaged the pump. I have to ask, since that line doesn't have anything to do with the carb, why did you remove it?

zukdrvr
03-07-2007, 09:20 AM
i put the carb on based on the instructions that came with it, and they said to remove it at one point and then never mentioned reinstalling it, i think im going to put it back on now though.