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  1. #1
    ercBOOSTED's Avatar
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    Fuel Pressure Gauge Is Not Stable

    I have a fuel pressure gauge that is not stable. I have it set at 45 psi. When I turn the ski on, it is at 45. I start out flying and then a little while later I lose 50-100 rpm's. Every time I check my fuel pressure and the gauge is down around 40. I take it home and let it sit. Next time I start it up on the hose, it is right back at 45 psi right where I set it. I know that the drop in fuel pressure is the cause for my slight loss of power, but does anyone know why. I also don't want to run lean and F something up. Any ideas?


  2. #2
    Take the time to smile sirbreaksalot's Avatar
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    Quote Originally Posted by erckawasaki View Post
    I have a fuel pressure gauge that is not stable. I have it set at 45 psi. When I turn the ski on, it is at 45. I start out flying and then a little while later I lose 50-100 rpm's. Every time I check my fuel pressure and the gauge is down around 40. I take it home and let it sit. Next time I start it up on the hose, it is right back at 45 psi right where I set it. I know that the drop in fuel pressure is the cause for my slight loss of power, but does anyone know why. I also don't want to run lean and F something up. Any ideas?

    buy a quality pressure reg and gauge

    I suggest SARD

    http://www.nengun.com/sard/fuel-regulator-type-rj
    this one can do over 700hp

    http://www.nengun.com/sard/fuel-regulator-8mm-nipple
    or even the smaller one only rated to 450 hp ,
    this one will do fine,
    its not the cheapest,
    But can u put a price on loosing fuel pressure at WOT
    I say start the bidding at $1000+ for engine repairs

    but others use the Magna-fuel

    Waz
    Last edited by sirbreaksalot; 08-20-2008 at 07:30 PM.

  3. #3
    ercBOOSTED's Avatar
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    Thanks. I definitely have to think about which one to get. Mine is not cutting it.

  4. #4
    Take the time to smile sirbreaksalot's Avatar
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    Talking

    Quote Originally Posted by erckawasaki View Post
    Thanks. I definitely have to think about which one to get. Mine is not cutting it.

    I have been thinking about your probs ERCKAWASAKI

    these are the areas that your problem is in

    1. Fuel pump to small or faulty, ( you did use a Walbro with pulley kit? )
    What pump did you use?
    2. Pressure regulator is not up to the job, ( this happens alot on cheap units, they are very inconsistent with the pressure they deliver)


    If you can get me those spec's it will make diagnosing the problem easier

    Waz

  5. #5
    ercBOOSTED's Avatar
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    I'll get that info tomorrow. Once I get that, I'll get back to you.
    Last edited by ercBOOSTED; 08-20-2008 at 10:07 PM.

  6. #6

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    Quote Originally Posted by erckawasaki View Post
    I have a fuel pressure gauge that is not stable. I have it set at 45 psi. When I turn the ski on, it is at 45. I start out flying and then a little while later I lose 50-100 rpm's. Every time I check my fuel pressure and the gauge is down around 40. I take it home and let it sit. Next time I start it up on the hose, it is right back at 45 psi right where I set it. I know that the drop in fuel pressure is the cause for my slight loss of power, but does anyone know why. I also don't want to run lean and F something up. Any ideas?
    have you ever had your fuel regulator come loose? i install my fuel regulator the same way you did, directly to the fuel rail and i feel that there's too much vibration unless you make a base to reinforce it in place. i would post a pic but don't know how to i will try to make a support for it today but if not i will remove it from where it is and mount it at the i/c like the others have done. i ran it on the water hose for like 5 minutes and already found a drop of fuel.

  7. #7
    ercBOOSTED's Avatar
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    turbo smart fuel pressure regulator, the pump was from r&D it was a worlbro 255. Never had a problem with it coming loose. I don't have to adjust it at all. It is locked in on the spot I had it. It goes to around 40 psi after it heats up and when I start it the next day it is back at 45. I have a new regulator coming tomorrow or the next day. Hopefully that works. If not, a new fuel pump would be the next option.

  8. #8
    Take the time to smile sirbreaksalot's Avatar
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    Quote Originally Posted by erckawasaki View Post
    turbo smart fuel pressure regulator, the pump was from r&D it was a worlbro 255. Never had a problem with it coming loose. I don't have to adjust it at all. It is locked in on the spot I had it. It goes to around 40 psi after it heats up and when I start it the next day it is back at 45. I have a new regulator coming tomorrow or the next day. Hopefully that works. If not, a new fuel pump would be the next option.

    Have All the internals of the standard pump/reg have been removed so only pump in the tank now?

    what sizi return line etc are you running?

    waz

  9. #9
    ercBOOSTED's Avatar
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    I'm still waiting to find out about the other questions that you asked me, but today I set the fuel pressure at 48 psi and when I put it on the trailer to run the water out, it was down to 43-44 psi. So apparently it changes about 3-5 psi during my ride.

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