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High fuel pressure

This is a discussion on High fuel pressure within the General Help forums, part of the LSx Technical Help Section category; I have a 99 camaro z28 and my fuel pressure guage is reading 78 psi, i have verified it with ...

  1. #1
    Junior Member southpaw0314's Avatar
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    High fuel pressure

    I have a 99 camaro z28 and my fuel pressure guage is reading 78 psi, i have verified it with 2 different guages. Im still on the stock fuel system. What should i check first?
    any help is appreciated.

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    Moderator Cutlass's Avatar
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    Visually inspect the return line from the Tee just past the fuel filter, back to the tank.
    If the return line is ok, then the problem is in the tank.

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    Junior Member southpaw0314's Avatar
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    so you think its the regulator?

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    Junior Member southpaw0314's Avatar
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    up top

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    Junior Member southpaw0314's Avatar
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    bump!

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    Yes most likely. And the regulator is in the gas tank. Its part of the fuel pump module

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    Veteran 0rion's Avatar
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    common misconception.....that thing you see between the rails is a pulse dampner and not a regulator. This may be the first time I've ever seen someones regulator go high like that if that ends up being the issue. Not sure I've read where anyone has had that problem....usually the other way around.

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by 0rion View Post
    This may be the first time I've ever seen someones regulator go high like that if that ends up being the issue. Not sure I've read where anyone has had that problem....usually the other way around.
    exactly. I can't ever remember seeing a regulator fail high...but I guess its possible.

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    Senior Member bills98ta's Avatar
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    Uhmm... I just installed twin walbro's, and now I'm over 70lb... That screws with the tune...

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    Veteran 0rion's Avatar
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    Quote Originally Posted by bills98ta View Post
    Uhmm... I just installed twin walbro's, and now I'm over 70lb... That screws with the tune...
    it will.....because you're injectors pulse stays the same while the pressure is higher so you'll spray more gas in the same amount of time. Did you do a whole fuel system with a return and regulator?

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    Senior Member bills98ta's Avatar
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    No. Just the pumps...

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    Quote Originally Posted by bills98ta View Post
    No. Just the pumps...
    were you asking about the tune or just adding that statement? There's an injector flow sheet that will let you input your fp to tell you what your injector table should be. Wasn't sure if you're aware of that.

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    I don't sell out! blackSS01's Avatar
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    A question since I've never seen a "High Fail" what would it do to the performance of the car
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    Quote Originally Posted by blackSS01 View Post
    A question since I've never seen a "High Fail" what would it do to the performance of the car
    Prolly put the AFR's out of whack..

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    Senior Member bills98ta's Avatar
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    Ya, it's out of whack... I'm not sure if the regulator can handle the twin pumps... If it would stay at 70lb consistently, it wouldn't be a problem, but it doesn't seem to be. I just installed these, and better do some more research.

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    Veteran 0rion's Avatar
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    Quote Originally Posted by blackSS01 View Post
    A question since I've never seen a "High Fail" what would it do to the performance of the car
    high FP should cause you to be rich.

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    I don't sell out! blackSS01's Avatar
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    Quote Originally Posted by 0rion View Post
    high FP should cause you to be rich.
    I see, I see

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    Senior Member bills98ta's Avatar
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    Got a new sensor for my LM-1 wideband, and here it just took a crap on me... I give up...

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    Quote Originally Posted by bills98ta View Post
    Got a new sensor for my LM-1 wideband, and here it just took a crap on me... I give up...
    are you going up the tail pipe or do you have a bung put in? If in a bung what position of the tail pipe is it in? Such as 3 oclock, 4 oclock ect? Condensation will kill those dead in no time flat......did it when I was running the LM1. Had it up the tail pipe and blew condensation in it...lasted about 2 seconds.

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    Senior Member bills98ta's Avatar
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    Bung at 2 oclock... The LM1 unit itself... The lcd went out. Holy Crapolla.
    I'm searching right now for another. Maybe a dual unit. Sent a PM on a FAST dual ! Guess the car won't be out this weekend.

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