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Home >> Jeep >> 1999 >> Wrangler SE, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System >> Fuel Pressure Test

Fuel Pressure Test

NOTE: For additional information on fuel pressure and fuel pump testing procedures, see CHRYSLER CORP. - SELF-DIAGNOSTICS - JEEP, TRUCKS & RWD VANS article.
NOTE: All models are equipped with a mechanical fuel pressure regulator located in fuel tank, inside fuel pump module. Excess fuel is returned to tank through fuel pressure regulator.
  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 CHRYSLER CORP. - SELF-DIAGNOSTICS - JEEP, TRUCKS & RWD VANS 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 REMOVAL, OVERHAUL & INSTALLATION article.
  4. If fuel pressure is okay, release fuel pressure. Remove test gauge hose. Install test port cap.
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