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Home >> Chevrolet >> 2002 >> Tracker 2D Utility, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel Systems >> Fuel System Diagnosis (2.5L) >> Diagnostic Procedure
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Diagnostic Procedure

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.5L TRACKER article. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Turn ignition off. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELIEF . Install fuel pressure gauge. Ensure vehicle has an adequate supply of fuel. Turn ignition on. Fuel pump should run for about 2 seconds. If fuel pressure is indicated on gauge, go to next step. If no fuel pressure is indicated on gauge, go to step  13.
    3. NOTE: In order to obtain maximum fuel pressure, it may be necessary to cycle ignition on to off, to on more than once.
  3. Turn ignition off. Turn ignition on. Fuel pump should run for about 2 seconds. Observe fuel pressure gauge while fuel pump is running. If fuel pressure is 39-45 psi (270-310 kPa), go to next step. If fuel pressure is not 39-45 psi (270-310 kPa), go to step  11.
  4. Turn ignition off. Observe fuel pressure gauge for one minute after fuel pump stops. If fuel pressure holds at 29 psi (200 kPa) or more, go to next step. If fuel pressure drops to less than 29 psi (200 kPa), go to step  7.
  5. Attempt to start engine. If engine starts and runs, leave engine running and go to next step. If engine does not start and run, perform FUEL INJECTOR CIRCUIT DIAGNOSIS .
  6. Allow engine to reach normal operating temperature. If fuel pressure is 30-37 psi (210-260 kPa), system is okay. If fuel pressure is not 30-37 psi (210-260 kPa), go to step  9.
  7. Check fuel injectors and fuel feed pipes and hoses for leaks. Repair as necessary. After repairs, go to step  19. If fuel injectors and fuel feed pipes and hoses are okay, go to next step.
  8. Turn ignition on. Fuel pump should run for about 2 seconds. Immediately after fuel pump stops, observe fuel pressure while blocking (pinching) fuel feed hose between fuel pressure gauge and fuel pump. If fuel pressure holds at 29 psi (200 kPa) or more, go to step  18. If fuel pressure drops to less than 29 psi (200 kPa), go to next step.
  9. Turn ignition on. Fuel pump should run for about 2 seconds. Observe fuel pressure while blocking (pinching) fuel return hose. If fuel pressure remains at 29 psi (200 kPa) or more, go to step  17. If fuel pressure does not remain at 29 psi (200 kPa) or more, go to next step.
  10. Check for faulty or improperly operating fuel injectors. See FUEL INJECTOR BALANCE TEST . Also 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 39 psi (270 kPa), go to next step. If fuel pressure is 39 psi (270 kPa) or more, go to step  15.
    12. NOTE: In order to obtain maximum fuel pressure it may be necessary to cycle ignition on to off, to on more than once.
  12. Turn ignition on. Fuel pump should run for about 2 seconds. Check fuel pressure while blocking (pinching) fuel return hose. If fuel pressure is 57 psi (400 kPa) or more, go to step  17. If fuel pressure is less than 57 psi (400 kPa), go to next step.
  13. If fuel pump relay diagnostic procedure was performed, go to next step. If fuel pump relay diagnostic procedure was not performed, go to FUEL PUMP ELECTRICAL CIRCUIT DIAGNOSIS under BASIC FUEL SYSTEM CHECKS in BASIC DIAGNOSTIC PROCEDURES - TRUCKS - TRACKER article.
  14. Check for a restricted fuel feed pipe, hose, or fuel filter. Also, check for restrictions or leaks in fuel feed pipes, hoses, or connections inside fuel tank. Also, check entire Fuel Pump circuit. Ensure battery voltage exists at fuel pump connector and fuel pump ground circuit has less than 5 ohms of resistance to ground. Repair as necessary. After repairs, go to step  19. If fuel lines, hoses, connections and all electrical circuits are okay, go to step  18.
  15. Turn ignition off. Relieve fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - TRACKER article. Disconnect fuel return hose from fuel pressure regulator. Connect a NEW fuel hose to fuel pressure regulator. Insert other end of NEW fuel hose into an approved gasoline container. Turn ignition on. If fuel pressure is 39-45 psi (270-310 kPa), go to next step. If fuel pressure is not 39-45 psi (270-310 kPa), go to step  17.
  16. Repair or replace restricted fuel return pipe or hose. After repairs, go to step  19.
  17. Replace fuel pressure regulator. After repairs, go to step  19.
  18. Replace fuel pump. After repairs, go to step  19.
  19. Operate vehicle under conditions which original symptom was noted. If system operates properly, system is okay. If system does not operate properly, see DIAGNOSTIC AIDS .
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