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  1. #1

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    GTX SC Fuel Pressure Issue

    2003 GTX SC

    Symptoms were ski would run great then randomly run like it's running out of gas. Most times shutting ski off for a few seconds and restarting would eliminate the issue for a while. It felt like a fuel delivery issue (no codes) so I figured I would start by checking fuel pressure.

    Here are the results after performing tests outlined in shop manual

    Fuel pump DOES cycle on for two seconds when plugging lanyard in
    Pressure jumps to about 55 then back to 0 within about 3 seconds
    While running, fuel pressure is a relatively steady 55. (Manual says 44)
    Pressure drops to 0 within about 3 seconds after shutting ski off

    There are no visible leaks at the top of the tank or the fuel rail

    It is obvious I have some kind of issue here, but I am unsure whether these are symptoms of a bad pump or a bad regulator. The manual only refers to replacing the entire module and does not get into troubleshooting each component individually.

    Thoughts?


  2. #2
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by marz831 View Post
    2003 GTX SC

    Symptoms were ski would run great then randomly run like it's running out of gas. ...

    Thoughts?
    What exactly are the symptoms when the trouble occurs?

    When was it last serviced?

    When was the supercharger last serviced?

    Old spark plugs?

  3. #3

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    Ski will start dropping in rpms, and will not accelerate. Sometimes rpms will only drop to 5000ish, other times it will not run above idle and will eventually stall.

    It will normally run fine after letting it sit for a few minutes.

    Plugs are new, SC was rebuilt last summer

  4. #4
    JT jpt7779's Avatar
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    I have seen this with a buddy's ski.........pull the fuel pump housing out of the tank and you will probably find a split hose, loose hose clamp, etc.

  5. #5

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    I will pull the pump and take a look. Should I be concerned that the pressure is 55lbs when the manual says it should be 44?

  6. #6

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    Pulled the pump. Looks to have been replaced at some point due to date on top. There was no filter at all on the bottom. The one on the inside attached to the pump is totally disintegrated.

  7. #7
    Myself's Avatar
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    I'm betting the micro screen in the pickup end of the fuel pump is blocked with debris judging by the look of that filter. As the fuel flows through it packs tighter and tighter choking off the fuel supply. As it sits a bit with no flow the particles seperate enough to allow some fuel to pass through again.

  8. #8

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    That makes sense. The other concern is that the system does not stay pressurized when the lanyard is plugged in or right after shutting off the engine. Is the check valve that is supposed to maintain pressure in the line located in the regulator or the pump?

    Quote Originally Posted by Myself View Post
    I'm betting the micro screen in the pickup end of the fuel pump is blocked with debris judging by the look of that filter. As the fuel flows through it packs tighter and tighter choking off the fuel supply. As it sits a bit with no flow the particles seperate enough to allow some fuel to pass through again.

  9. #9

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    Just want to post this link in this thread for future searches. These guys seem to be about the only ones on the planet who sell the fuel pressure regulators by themselves.

    https://www.highflowfuel.com/c-12079...ft-seadoo.html

  10. #10
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by marz831 View Post
    That makes sense. The other concern is that the system does not stay pressurized when the lanyard is plugged in or right after shutting off the engine. Is the check valve that is supposed to maintain pressure in the line located in the regulator or the pump?
    What was the outcome of your fuel issue?

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