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Home >> Chevrolet >> 1999 >> Tracker 4D Utility, 4WD, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Basic Engine Testing >> Basic Fuel System Checks >> Fuel System Pressure Test
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Fuel System Pressure Test

  1. Perform On-Board Diagnostic (OBD) System Check. See ON- BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
  2. Turn ignition off. Install fuel pressure gauge. Ensure vehicle has an adequate supply of fuel. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. Observe fuel pressure gauge. If fuel pressure exists, go to next step. If fuel pressure does not exist, go to step  13 .
  3. Turn ignition off. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. It may be necessary to cycle ignition several times to obtain maximum pressure. Observe fuel pressure gauge while fuel pump is running. If fuel pressure is 36-43 psi (2.5-3.0 kg/cm2 ), go to next step. If fuel pressure is not 36-43 psi (2.5-3.0 kg/cm2 ), go to step  11 .
  4. Turn ignition off. Observe fuel pressure gauge for one minute after fuel pump stops. If fuel pressure holds at 25 psi (1.8 kg/cm2 ) or greater, go to next step. If fuel pressure does not hold at 25 psi (1.8 kg/cm2 ) or greater, go to step  7 .
  5. Start engine. If vehicle starts and runs, go to next step. If vehicle does not start and run, diagnose fuel injector circuit. See FUEL SYSTEM in appropriate SYSTEM & COMPONENT TESTING article.
  6. Warm engine to normal operating temperature. Observe fuel pressure gauge. If fuel pressure is 30-37 psi (2.1-2.6 kg/cm2 ), system is okay. If fuel pressure is not 30-37 psi (2.1-2.6 kg/cm2 ), go to step  9 .
  7. Check fuel injectors, and fuel feed pipes and hoses for leaks. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step  19 .
  8. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. Observe fuel pressure gauge immediately after fuel pump stops while blocking (pinching) fuel feed hose between fuel pressure gauge and fuel pump. If fuel pressure holds at 25 psi (1.8 kg/cm2 ) or greater, go to step  18 . If fuel pressure does not hold at 25 psi (1.8 kg/cm2 ) or greater, go to next step.
  9. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. Observe fuel pressure gauge while blocking (pinching) fuel return hose. If fuel pressure holds at 25 psi (1.8 kg/cm2 ) or greater, go to step  17 . If fuel pressure does not hold at 25 psi (1.8 kg/cm2 ) or greater, go to next step.
  10. Check for faulty or improperly operating fuel injectors. Check for a leaking fuel pressure regulator. Repair or replace as necessary. After repairs, go to step  19 .
  11. If fuel pressure is less than 36 psi (2.5 kg/cm2 ), go to next step. If fuel pressure is greater than 36 psi (2.5 kg/cm2 ), go to step  15 .
  12. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. It may be necessary to cycle ignition several times to obtain maximum pressure. Observe fuel pressure gauge while blocking (pinching) fuel return hose. If fuel pressure is 57 psi (4.0 kg/cm2 ) or greater, go to step  17 . If fuel pressure is less than 57 psi (4.0 kg/cm2 ), go to next step.
  13. Perform fuel pump relay circuit diagnosis. See FUEL PUMP RELAY CIRCUIT DIAGNOSIS  . After performing fuel pump relay circuit diagnosis, go to next step.
  14. Check for restrictions in fuel feed pipe, hose, or fuel filter. Check for restrictions or leaks in fuel feed pipes, hoses, or connections inside fuel tank. Inspect fuel pump circuit. Ensure battery voltage is present at fuel pump connector and resistance to ground is less than 5 ohms. If problem does not exist, go to step  18 . If problem exists, repair as necessary and go to step  19 .
  15. Turn ignition off. Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELIEF  . Disconnect fuel return hose from fuel pressure regulator. Connect a new fuel hose to fuel pressure regulator. Place other end of hose in approved gasoline container. Turn ignition on with engine off. Observe fuel pressure. If fuel pressure is 36-43 psi (2.5-3.0 kg/cm2 ), go to next step. If fuel pressure is not 36-43 psi (2.5-3.0 kg/cm2 ), go to step  17 .
  16. Repair or replace restricted fuel return pipe or hose. After repairs, go to step  19 .
  17. Replace fuel pump pressure regulator. After repairs, go to step  19 .
  18. Replace fuel pump. After repairs, go to next step.
  19. Operate vehicle under conditions which original symptom was noted. If system operates properly, system is okay. If system does not operate properly, check for an intermittent condition which may be caused by poor connection, rubbed-through insulation, or a broken wire inside insulation. Check harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, or poor terminal-to-wire connections before component replacement. Repair as necessary.
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