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  1. #1

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    RRFPR On 2011 rxtx 260 not keeping 58psi

    Having an issue with my rxtx 260 not getting to full rpm and speed. Not sure it itís just when itís warm or if itís from the start of the run, just noticed this today and ran a good bit at 56mph before punching it and noticing Iím only getting to 59 mph.
    checked the RRFPR and it was on the 48psi range. Adjusted it and I canít get it to stay at 58, it starts their when I start the ski but the over the next minute or two itís back to 45 or so. I know I donít need an RRFPR but it was on the ski when I purchased it. Iíve taken the reference line off the manifold and caped the manifold leaving the line dangle off the RRFPR.
    Does anyone know what could help, Iíve had the supercharger rebuilt maybe 20 hours ago, new Riva intercooler about 20 hours ago as well.


  2. #2
    SplishSplash's Avatar
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    You say you removed the reference line, was that because the pressure is dropping or made no differnce?

  3. #3

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    Pressure was set at 68 and was rising from there. That’s when I found out what that was. Not a complete newb anymore but I was when this ski started. This thing has given me lots of issues over 4 years, head gasket, intercooler, and this.

  4. #4
    JT jpt7779's Avatar
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    Have you taken the RRFPR apart and inspected the diagram and spring? It is not uncommon for both to deteriorate!

    If they are ok, pull the fuel pump and inspect all hoses very closely. I have seen split hoses do exactly as you are describing.


  5. #5

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    I’m planning on pulling it out of the water today after a test to see if this is only happening when the ski is hot.
    i think it could very well be this as I can adjust the RRFPR to 40 psi by turning the hex screw but I can’t get it up when it’s running no matter how much I turn it. Can the Diaphragm and spring be replaced or would I need to replace the entire unit?
    ill be able to report more in the next 12 hours.
    also I did pull the throttle body before putting the ski in the water this year, is their any way this could be causing this issue,I’ll pull that again and make sure I installed it correctly.
    Last edited by Mosser; 06-29-2020 at 10:14 AM.

  6. #6

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    This looks pretty good to me but you guys tell me.
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  7. #7

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    Plugs Look pretty good too but I’ll change em anyway, they are cheap relative to the rest of the parts.
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  8. #8

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    Well it ran good today for a while then it seems like it gets heat soaked. 82 degrees 58% humidity and about 550ft elevation.
    checked the intercooler, that only has 20 hours on it, it’s not leaking into the throttle body.

  9. #9
    JT jpt7779's Avatar
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    When the engine is at idle is it holding 58 psi or not?

    It is normal for the pressure to bleed off once the engine is shut off.

  10. #10
    EVN81's Avatar
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    Quote Originally Posted by Mosser View Post
    I can adjust the RRFPR to 40 psi by turning the hex screw but I canít get it up
    So the problem must be either your fuelpump, the block off plate or a split hose as mentioned before.
    With engine idle it should be easy to turn the pressure over 60psi

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