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andrew
andrew 3/23/2010
2000 GMC Sierra 1500 SLE 8Cyl5.3L - Engine
i put a new fuel pump in but not the sending unit.at first it started great but now its back to hard starting
but if i turn the key on and off a couple times and then start it it fires right up.so i think that it could be the sending unit but i dont know.
1 Answer
  • HouseCallAuto
    HouseCallAuto 3/23/2010
    The sending unit has no relationship to the fuel pump. It only operates the fuel gauge. You need to read the fuel pressure with a gauge. But before that, replace the fuel filter if you have not replaced it. A clogged fuel filter can give you a hard start.

    Kevin
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