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Mitsubishi U 42T flooding

Discussion in 'Introductions' started by Jay Broadwell, Apr 27, 2021.

  1. Jay Broadwell

    Jay Broadwell New Member

    I installed a new carburetor on my U 42t and it ran fine for several weeks but now it is pouring gas out of the carburetor throat and the 2 secondary Jet vents and the oblong slot hole above the Venturi. I know or guess that it’s a stuck float and needle but checking if it could be anything else. The truck runs fine for a minute or so and then starts pouring gas even at a high rpm and then dies. If I disconnect the gas line it starts and runs until out of gas. I have done everything but remove the carb. Please give advice on your experiences.
  2. fmartin_gila

    fmartin_gila Active Member

    Sounds like you may have some dirt or such stuck & holding the float valve open. Gonna have to open it to find.

  3. Jigs-n-fixtures

    Jigs-n-fixtures Well-Known Member

    Check the fuel pressure at the carb first. The carbs only wan to see about 2 to 2-1/2-lbs of pressure any more than that and the fuel will push past the float.
  4. Jay Broadwell

    Jay Broadwell New Member

  5. Jay Broadwell

    Jay Broadwell New Member

    Thank you for the reply. I figured that but I just hated to take the carb off Ana apart.
  6. Jay Broadwell

    Jay Broadwell New Member

    Thanks I will check that before taking the carb off and apart
  7. Jigs-n-fixtures

    Jigs-n-fixtures Well-Known Member

    On my Hijet the charcoal canister had become plugged, and was preventing proper venting of the fuel tank. As the pressure built up, the pressure on the fuel return line would go up, and it couldn’t regulate the pressure by dumping fuel back to the tank. So, it would overpressure enough to flood the carb after it ran for a bit.
  8. Ohkei Dohkei

    Ohkei Dohkei Active Member

    Remove the gas cap and see if it still happens. If it doesn't it could be what Jigs is saying. It is warming up outside. If it still does, it's likely a stuck or improperly adjusted float or trash in the needle
    Limestone likes this.

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