1980 mack fuel issue

Discussion in 'Mack Forum' started by Cjkcustoms, Mar 8, 2022.

  1. Cjkcustoms

    Cjkcustoms Bobtail Member

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    Mar 8, 2022
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    If you keep it off of idle it will run and drive. It is when it sits at idle it happens
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    Think I wound be looking at the check valves in the supply pump. Install clear fuel line to check for where air gets in the system after that.
     
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  4. BoxCarKidd

    BoxCarKidd Road Train Member

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    Also thank there is a relief valve - regulator in the fuel outlet line. Check that out. The piston in the mechanical supply pump could be sticking. Take that apart and check it out.
     
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