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pressure leak

  1. Barn Shop

    Mcculloch Mac140 oil pump

    Info needed, I have a McCulloch Mac140 that is leaking pressure from the oil pump while performing a pressure/vac test, I know this is a diaphragm style pump operated by a crankcase pulse like the fuel pump but am unsure if there should be a pressure leak from the pump. I would think this would...
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