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Home >> Dodge and Ram >> 1998 >> Durango 5.2 Y, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 3.9L >> Fuel System >> Fuel Pressure Test >> Vehicles With Fuel Rail Test Port
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Vehicles With Fuel Rail Test Port

  1. Disconnect negative battery cable. Release fuel pressure. See FUEL PRESSURE RELEASE under FUEL SYSTEM. Install fuel pressure gauge with hose on fuel pressure test port.
  2. Start engine and allow to idle. Fuel pressure should be 44-54 psi (3.1-3.8 kg/cm2 ). If no fuel pressure exists and engine will not start, fuel pump relay and control circuit may be defective. See FUEL PUMP RELAY under FUEL SYSTEM.
  3. If fuel pressure exceeds specification, fuel pump is okay, but fuel pressure regulator is defective. Replace fuel pressure regulator. Fuel pressure regulator is incorporated with the fuel filter. Fuel filter/fuel pressure regulator is located on top of fuel tank, at fuel pump module. See appropriate REMOVE/INSTALL/OVERHAUL - 3.9L article.
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