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engine surges and loss of power


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i have have a 86 r model with a 300 engine. The engine always had a surging issue and recently has gotten worse. It also losses power on a extended hard pull. I believe the supply fuel pump may be getting weak. It has Pai 3597 on the pump. Are there rebuild kits availiable for this pump? i heard that it is somewhat common for these engines to surge. I bled the fuel system buy pumping air into the fuel tank with the feed line to the injection pump off. It pushed fuel backwards out of the injection pump as well as pushing it out the feed line. I think it shouldnt have pushed fuel out the injection pump but not sure. Thanks in advance for any help on this problem Andy

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