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Transportation → Autos & motorcycles → Car Makes & Models → Makes A - H → GMC models → GMC trucks
ANSWERS: 1
  • csimme01 and Ninja Cooper UNMASKED
    There is a test port on the fuel rail. A fuel pressure gage is attached to the port and the fuel pump is turned on with a scan tool or with a jumper in the fuel pump relay to read the pressure. This is compaired to the spec fuel pressure. This is different for each engine.
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