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  1. #1
    inteljd's Avatar
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    HELP!! Rude RRFPR pressure issue!!

    I need some schooling on this one. I have a Rude RRFPR that is lowering pressure instead of increasing it when I open up the throttle. If I have it set at 65psi at idle and I goose the throttle it jumps down to 50 - 45psi. At wide open throttle I'm jumping down to 55psi. If I increase the psi to say 80 the same scenario happens. My AFR at wide open throttle is 13.2 to 14!! I won't stay there long only to test with. I'm at 3000ft elevation but I should still be able to get to 11.9 - 12.2 on the AFR right? By the way I'm running a stock ECU with an ET-140 and 50lb injectors. I guess none of that matters if the fuel pressure only drops.

    Any idea out there?


  2. #2
    speedskixp's Avatar
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    Quote Originally Posted by inteljd View Post
    I need some schooling on this one. I have a Rude RRFPR that is lowering pressure instead of increasing it when I open up the throttle. If I have it set at 65psi at idle and I goose the throttle it jumps down to 50 - 45psi. At wide open throttle I'm jumping down to 55psi. If I increase the psi to say 80 the same scenario happens. My AFR at wide open throttle is 13.2 to 14!! I won't stay there long only to test with. I'm at 3000ft elevation but I should still be able to get to 11.9 - 12.2 on the AFR right? By the way I'm running a stock ECU with an ET-140 and 50lb injectors. I guess none of that matters if the fuel pressure only drops.

    Any idea out there?
    Jerry , it sounds like you have a weak fuel pump. You should pick-up a walbro 255part# gss342. Also, where are your rpms? The reason I ask is because with your ski if the rpms are pegging 8150+ it is on the limiter and you cant check a/f like that or it will be lean.
    I think with that set-up you gonna need somewhere between 65 and 70 psi at wot.

  3. #3
    inteljd's Avatar
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    Even if the pump was weak shouldn't the pressure still go up with the boost?

  4. #4
    speedskixp's Avatar
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    Quote Originally Posted by inteljd View Post
    Even if the pump was weak shouldn't the pressure still go up with the boost?
    No. Not if it cant handle the volume at the higher pressure. This is a common issue that alot of us were having with the stock fuel pump. I had the same exact issue with the same basic set-up you are running.
    http://www.greenhulk.net/forums/show...ghlight=walbro
    Check out this thread.
    I was running a 65lb base pressure with that set-up and the walbro in the good weather and 60lb base in the good weather with 48lb injectors.

  5. #5
    inteljd's Avatar
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    Right on - thank you.

  6. #6
    speedskixp's Avatar
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    Quote Originally Posted by inteljd View Post
    Right on - thank you.
    No problem. I added some more info to my previous post that you may have missed. Check out this thread.

    http://www.greenhulk.net/forums/show...ghlight=walbro

  7. #7
    inteljd's Avatar
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    Smile

    Well I installed the new fuel pump as suggested and the problem is solved!! THANK YOU Speedskixp!!

  8. #8
    speedskixp's Avatar
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    Good deal! Where did you get a pump so fast?

  9. #9
    inteljd's Avatar
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    Summit racing

  10. #10
    State of Confusion BartenderSmalley's Avatar
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    Quote Originally Posted by inteljd View Post
    Well I installed the new fuel pump as suggested and the problem is solved!! THANK YOU Speedskixp!!

    Damnit man. I hope I don't have to go now and get an upgraded fuel pump. Just put the RRFPR on...haven't tested it yet at WOT.

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