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  1. Vintage iron

    M923/A1 Fuel system common issues

    Where did you read this test results?
  2. Vintage iron

    M923/A1 Fuel system common issues

    I wasn't aware of the testing. Very good to know. I will have to try the 2 cycle oil. Thank you
  3. Vintage iron

    M923/A1 Fuel system common issues

    Yes, this would apply to all M939 series trucks with a Cummins 250. The new low sulfur road diesel has less lubricating properties and tends to get stale quick. I put two gallons in a full tank. Your engine with run quieter and stronger! Only problem is that ATF is Red. So I just use it to douch...
  4. Vintage iron

    M923/A1 Fuel system common issues

    I have been working on military trucks full time for a few years now. I have found some of the same issues with the fuel system on M923 and M923A1. Customers will bring me a truck that has hard starting or rough idle or weak throttle response. First thing I do is change the fuel filter. while...
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