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  1. G

    2008 MD90B not starting

    Do you know the piston ring clocking positions on the tohatsu air compressor piston?
  2. G

    2008 MD90B not starting

    Thanks again. You've been a great help. Do I need to be concerned about what may have caused it to go bad? I ordered a new one, and I also ordered a new cylinder and piston rings, as those were the used parts I put together and got it to run about 6-outings. Just wondering if something could be...
  3. G

    2008 MD90B not starting

    Well the hose was not the problem. Everything inside Air Compressor looks good except I'm not sure about the Reed Valve. The side with the two hard valves seem to be bending upward. I'm not sure if this is what is suppose to look like. I will attach a couple pics, please let me know what you...
  4. G

    2008 MD90B not starting

    Thanks, going to put it together in next day or so. It’s hot here in Texas 106 degrees so when I get an early morning or evening, I’ll update soon.
  5. G

    2008 MD90B not starting

    Ok, I got it running. Along with the pressure regulator problem, I also had an air compressor problem. Was able to find some used parts for it and got it running good for several outings, and it quit again. No air pressure, so I pulled it off, inspected it and it appears to be ok, I pulled it...
  6. G

    2008 MD90B not starting

    I am an electrician so pretty comfortable working with wiring. Do you know where I can find schematics and diagnostic values. Everything looks good.
  7. G

    2008 MD90B not starting

    OK, Nothing has moved on the wiring end, it should be 12V coming directly from ECU, is that correct? Do you know what pins and connector for this from ECU? Sure hope its not ECU.
  8. G

    2008 MD90B not starting

    Hey, Thanks, I pulled the rail and the Fuel Regulator was definitely bad the screens were torn pretty badly. Between Hernia Surgery and waiting on parts, I finally got it all back together. I tested it yesterday and it ran for a couple minutes, I slowly went to a higher rev with lever and it...
  9. G

    2008 MD90B not starting

    I pulled the regulators, fuel regulator had a tear in one screen, air regulator had fuel in it, is this normal? I am going to take off the rail and go through the whole thing again. Thanks for your input.
  10. G

    2008 MD90B not starting

    Sorry, I'm not a Technician, just an avid DIY'er, and electrician by trade. I appreciate any help, but will take it to qualified person if it appears to be over my head. lol
  11. G

    2008 MD90B not starting

    Thanks, I’ll check that later today. Will I need to be cranking the engine to get static pressure readings? Or just with key in on position?
  12. G

    2008 MD90B not starting

    First try from winter storage, in Texas so not terribly cold but been 6months. I replaced Spark Plugs, getting fire. Rebuilt Rail, high pressure fuel pump 3-years ago. I’m suspecting fuel pump again? How can I test to see if it is working? After trying for a while, gas started coming out of...
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