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    PLEASE HELP! Electronic problem V3500

    Things that I need to check. ECM power, possibly shorted, but the engine runs. Oil pressure switch wires shorted. I need to figure out where the fuel pump wire goes to from the relay, so I can run a wire to bypass it. I'm not good with electronic stuff. I'm a tool and die maker. Give me a chunk...
  2. S

    PLEASE HELP! Electronic problem V3500

    PLEASE HELP! I have a 89 GMC V3500 4x4 TBI 454 TH400 Crew Cab Dually 150k miles. It has duel tanks but only the left (original) tank is cleaned with a new pump and sending unit. PLEASE read before commenting. I'm having FUEL PUMP and overall starting problems. I was driving steadily at about...

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