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Home >> Jeep >> 1998 >> Cherokee Classic, 4.0 S, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 2.5L >> Fuel System >> Fuel Pressure Test >> Fuel Rail With Fuel Pressure Test Port
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Fuel Rail With Fuel Pressure Test Port

  1. Release fuel pressure. See FUEL PRESSURE RELEASE. Remove test port cap. Install a 0-60 psi (0-4.2 kg/cm2 ) fuel pressure gauge at test port.
  2. Start engine and allow to idle. Fuel pressure should be 44.2-54.2 psi (3.1-3.7 kg/cm2 ). If no fuel pressure exists, fuel pump relay control circuit may be defective. See TEST TC-101A, in TESTS W/CODES article.
  3. If fuel pressure exceeds specification, fuel pump is okay, but fuel pressure regulator is defective. Release fuel pressure and replace fuel pump module. See REMOVE/INSTALL/OVERHAUL article.
  4. If fuel pressure is okay, release fuel pressure. Remove test gauge hose. Install test port cap.
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