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Test NS-4C - Repairing Low Fuel Pressure

WARNING: High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE . DO NOT allow fuel pressure to exceed 70 psi (4.9 kg/cm2 ) during step 1).
  1. With scan tool still actuating ASD fuel system, gently squeeze fuel return hose. Observe fuel pressure gauge. If fuel pressure is more than 43 psi (3.0 kg/cm2 ), stop ASD fuel system actuation. Replace fuel pressure regulator. Perform TEST VER-1A. If fuel pressure is 43 psi (3.0 kg/cm2 ) or less, go to next step.
  2. Using scan tool, stop ASD fuel system actuation. Inspect fuel lines between fuel rail/fuel pump for a kink or restriction. If kink or restriction present, repair as necessary. Perform TEST VER-1A. If a kink or restriction is not present, go to next step.
  3. Release fuel pressure. Remove fuel filter. Inspect fuel filter for a restriction. If fuel filter is restricted, ensure fuel tank is not contaminated and replace fuel filter. Perform TEST VER-1A. If fuel filter is not restricted, reinstall fuel filter. Ensure fuel tank is not contaminated and replace fuel pump and inlet strainer. Perform TEST VER-1A.
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