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  1. #1
    Madmike1's Avatar
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    Fuel pressure changes

    I just installed a DIY FPR in my ski a couple of weeks ago... I set it at 58psi warm initially but I find that the value can change quite a bit through the course of the day. Today it started at 62psi but was down to 50 psi within 30 minutes. I re-adjusted to 58 then and it didn't change throughout my ride again. Is this normal or should it be rock steady?


  2. #2
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    With a quality regulator.... you shouldn't have to touch it when set. Dropping 12 lbs is a big problem!

  3. #3
    Quote Originally Posted by BigDaddyRXP View Post
    With a quality regulator.... you shouldn't have to touch it when set. Dropping 12 lbs is a big problem!
    With a stock FPR and Pump, I see about 59.5-60 at idle and it drops to about 56.5 aw WOT. It is very repeatable and predictable. Having a dropping pressure with time is an indication of a dying pump.

    Andy
    Last edited by whittlebeast; 07-30-2014 at 06:34 PM.

  4. #4
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Quote Originally Posted by whittlebeast View Post
    With a stock FPR and Pump, I see about 95-60 at idle and it drops to about 56.5 aw WOT. It is very repeatable and predictable. Having a dropping pressure with time is an indication of a dying pump.

    Andy

  5. #5
    JT jpt7779's Avatar
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    BigDaddy is correct, I set mine while running at idle to 58 psi static, and it does not budge all day long ….rock solid.

    Aeromotive FP with Riva RRFPR set static, ID 1000cc injectors.

  6. #6
    I fixed the post.... Sorry

  7. #7
    Madmike1's Avatar
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    Damn that's what I was worried about... I put a brand new walbro fuel pump in it and am using a billet fpr regulator with a aeromotive diaphragm and stainless spring.


    thanks

  8. #8
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    I had a similar problem....came out to be that the pump was bypassing the fuel where the nozzle of the new walbro pump meets that rubber grommet. I thought it was the fuel pump because it would do exactly as you noted.

    I ended up buying submersible fuel line and clamping it direct from the fuel pump to the regulator.

  9. #9
    Madmike1's Avatar
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    I did use the submersible fuel line with clamps but did notice that the hose would bend and kind of kink when the unit was compressed... I thought I shortened it enough but maybe it is kinking?

  10. #10
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    You must run a loop making it short might help but you have to make it just the right length

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