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  1. #1

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    Low Fuel Pressure 2007 STX 12F

    Low Fuel Pressure 2007 STX 12F

    So it would seem like my pressure regulator is toast...

    can I buy a new one for inside the tank? or do I purchase an inline one..

    or is there a simple way to fix what is in the tank?

    I have about 10psi and the machine won't start

    if I crimp the return line, PSI goes up to 90 and the machine fires right up


  2. #2

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    Good questions, Mikey....I'm listening for a response also.

  3. #3

    Join Date
    Sep 2009
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    So I looked up and found this fuel regulator...16162-3701 looks to be small and inline..

    any one have any ideas how much pressure these machines below need to run? I'm wondering if I can just pop it inline in mine, remove the one that is presently in the tank...and hopefully i'll be good to go.



    This Kawasaki 16162-3701 REGULATOR-FUEL is also used on these models and components:
    2000 JT1100-C1 1100 STX D.I. FUEL PUMP
    2001 JH1100-B1 Ultra 130 FUEL PUMP
    2001 JT1100-F1 1100 STX D.I. FUEL PUMP
    2002 JH1100-B2 Ultra 130 FUEL PUMP
    2002 JT1100-F2 1100 STX D.I. FUEL PUMP
    2003 JH1100-B3 Ultra 130 FUEL PUMP
    2003 JT1100-G1 1100 STX D.I. FUEL PUMP
    2004 JH1100-B4 Ultra 130 FUEL PUMP

  4. #4

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    Standard is 43 psi at idle

  5. #5
    It's a bit of work but you can likey fix the old regulator... I just did mine last week. Understand- this is a hokey fix and you take all risks in trying this but it worked for me.

    You need to have a way to measure pressure- I used an air compressor with adjustable pressure regulator (with gauge on it). Basically- you remove the fuel regulator from inside the fuel pump housing and pull it off the return pipe (only held in by an oring once you remove the screws that hold it to the sheetmetal cage).

    Once apart- you find a way to attach the compressed air hose to where the return line went on the fuel regulator. I used a blow gun with a rubber nozzle on the front. Set the compressors regulator low (10 psi or less) and while holding the blow gun against the fuel pressure regulator @ the return pipe junction try blowing through the fuel regulator- see if it holds at 10 PSI. If it holds, while holding the blow gun trying to force air through the regulator, have someone turn up the pressure on the compressor regulator slowly until the fuel pressure regulator begins to bleed air. Note the PSI.

    Mine was opening at 25 PSI. To increase the opening pressure on the fuel regulator, you need to add spring pressure to the diapragm that casues pressure to build. There is a sheet metal cap at the base of the regulator- it looks like a thimble and is crimped around the regulator housing. You need to compress that whole cap so the spring inside it also compresses (adding pressure). I did mine with a hydraulic press and press jig I made up. you may be abe to use good vise to do the same thing.

    After 2 tries, my fuel pressure went from 25 psi to 45 psi (2 over the stock 43).

  6. #6

    Join Date
    Sep 2009
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    I bought one of these pressure regulators $50 (at a local store / $25 on ebay), set it to about 45psi at idle, and the machine fires right up and runs basically mint.

    I mounted it below the mini storage, so I can see the pressure if I open the hood. So far so good, had my machine going for about two hours today.

    Click image for larger version. 

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  7. #7
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Re: Low Fuel Pressure 2007 STX 12F

    Check the bolts on that regulator. I have a 150 dollar fuelab regulator and mine were slightly loose.

    Sean

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