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Fuel check valve

This is a discussion on Fuel check valve within the General Help forums, part of the LSx Technical Help Section category; I have a 255lph fuel pump and new regulator that runs at 58psi but doesnt hold any residual pressure at ...

  1. #1
    never enough ponyslayer's Avatar
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    Fuel check valve

    I have a 255lph fuel pump and new regulator that runs at 58psi but doesnt hold any residual pressure at all. Has anyone tried installing an inline check valve to fix this?

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    never enough ponyslayer's Avatar
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    or any suggestions...

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    The pump should have a built in check valve. Also check for a leaky flex tube/hose for the fuel pump inside the tank. There have been a couple guys here that have had that.

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    Veteran 0rion's Avatar
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    Quote Originally Posted by Cutlass View Post
    The pump should have a built in check valve. Also check for a leaky flex tube/hose for the fuel pump inside the tank. There have been a couple guys here that have had that.
    this is where my money is at......seen that be a problem multiple times.
    Quote Originally Posted by Mean Green Z28 View Post
    Don't worry about understanding women. Women understand women, and they hate each other

  5. #5
    The Generals Finest Deviant LS1's Avatar
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    What year is your car and what pump did you use? 98 metal tank cars can use any universal walbro. 99+ Plastic tank cars need to use a walbro with a venturi fitting like so.



    The venturi line needs to be hooked up to that brass fitting. Without it you will bleed off pressure as soon as the car keys offs and you'll have 1/4 fill tank issues.

  6. #6
    never enough ponyslayer's Avatar
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    Quote Originally Posted by Cutlass View Post
    The pump should have a built in check valve. Also check for a leaky flex tube/hose for the fuel pump inside the tank. There have been a couple guys here that have had that.
    yeah i figured the check valve in the pump isnt working but couldnt find a replacement...

  7. #7
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    Did you ever find a proper check valve? All I've found thus far is mention of mcmaster-carr but no sizing etc info :/

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