Re: 1987 Marathon 3PG wont run
those usually don't have a one way valve. could it be a filter? if you're using another tank it still may need to be primed. also, if the seals are bad you not get a strong pulse to the fuel pump. you can pull the pump and open it up to check for cracks in the diaphram. just be sure to note arrows on the pump and which way they go.
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