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Test NS-4B - Repairing High Fuel Pressure

WARNING: High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE .
  1. Inspect fuel return tube for restriction between fuel filter and fuel pump module. If a restriction is present, replace restricted fuel tube. Perform TEST VER-1A. If a restriction is not present, replace in-tank fuel pressure regulator. Perform TEST VER-1A.
  2. Turn ignition off. Ensure fuel tank is at least 1/4 full before performing this test. Release fuel pressure. Disconnect fuel return hose at fuel rail. Connect a 6 foot fuel hose to fuel rail. Place other end of 6 foot fuel hose into an approved 2 gallon or more capacity fuel container. Go to next step.
  3. Connect a fuel pressure gauge to fuel rail. Turn ignition on. Using scan tool, actuate ASD fuel system and observe fuel pressure gauge. Using scan tool, stop ASD fuel system actuation. If fuel pressure was less than 53 psi (3.7 kg/cm2 ), repair restriction in fuel return line from fuel tank to fuel rail. Perform TEST VER-1A. If fuel pressure was 53 psi (3.7 kg/cm2 ) or more, replace fuel pressure regulator. Perform TEST VER-1A.
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