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Test NTC-7: Checking Fuel Delivery

    WARNING: Fuel system is under high pressure and fuel pressure must be released before opening fuel system.
  1. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  . Connect fuel pressure gauge to fuel pressure test port on fuel rail. Turn ignition on with engine off. Using scan tool, actuate ASD fuel system test and note fuel pressure. Fuel pressure should be 44.2-54.2 psi (3.10-3.81 kg/cm2 ). Stop actuation of ASD fuel system test. If fuel pressure is less than 44.2 psi (3.10 kg/cm2 ), go to next step. If fuel pressure is 44.2-54.2 psi (3.10-3.81 kg/cm2 ), go to step  4 . If fuel pressure exceeds 54.2 psi (3.81 kg/cm2 ), replace fuel filter/fuel pressure regulator. Fuel filter/fuel pressure regulator is mounted in rubber grommet on top of fuel pump module. Fuel pump module is located on top of fuel tank. See FUEL FILTER/FUEL PRESSURE REGULATOR under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - TRUCKS & RWD VANS - GASOLINE article.
  2. Inspect fuel supply line between fuel tank and fuel rail for signs of damage or restrictions. If no signs of damage or restrictions exist on fuel supply line, go to next step. If signs of damage or restrictions exist on fuel supply line, repair or replace fuel supply line as necessary.
  3. Remove fuel pump module from fuel tank. See FUEL PUMP MODULE under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - TRUCKS & RWD VANS - GASOLINE article. Inspect fuel pump inlet strainer on bottom of fuel pump module for restrictions. If fuel pump inlet strainer is not restricted, replace fuel pump module. If fuel pump inlet strainer is restricted, replace fuel pump inlet strainer.
  4. Fuel pump volume should be checked. Release fuel pressure. Disconnect fuel supply from fuel rail. Connect Fuel Line Adapter (6539 for 5/16" fuel line or 6631 for 3/8" fuel line) to disconnected fuel supply line. Place other end of fuel line adapter in graduated cylinder.
  5. Turn ignition on with engine off. Using scan tool, actuate ASD fuel system test to operate fuel pump for no more than 7 seconds and note fuel pump volume. DO NOT operate fuel pump for more than 7 seconds or fuel pump may be damaged. Stop ASD fuel system test.
  6. Fuel pump volume should be at least .52 pint (.25 liter) in 7 seconds. If fuel pump volume is within specification, remove fuel line adapter, reconnect fuel supply line. Test is complete. If fuel pump volume is not within specification, remove fuel line adapter and reconnect fuel supply line. Check for restricted fuel supply line between fuel rail and fuel pump module on top of fuel tank. If no kinks or restrictions exist on fuel supply line, improper fuel pump volume may be caused by restricted fuel pump inlet strainer on bottom of fuel pump module or defective fuel pump module. Replace components as necessary.
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