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Home >> Chevrolet >> 1998 >> Tracker 2D Utility, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Engine Testing >> Fuel System >> Fuel System Pressure Diagnosis
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Fuel System Pressure Diagnosis

  1. Perform On-Board Diagnostic (OBD) System Check. See ON- BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in TESTS W/CODES article. After performing OBD system check, go to next step.
  2. Turn ignition switch to LOCK position. Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELIEF  . Install fuel pressure gauge. Turn ignition switch to RUN position. Turn ignition switch to LOCK position and then to RUN position. Observe fuel pressure gauge. If 36-43 psi (2.5-3.0 kg/cm2 ) exists, go to next step. If 36-43 psi (2.5-3.0 kg/cm2 ) does not exist, go to step 6).
  3. Turn ignition switch to LOCK position. Observe fuel pressure gauge one minute after fuel pump stops. If 25 psi (1.8 kg/cm2 ) or greater exists, go to next step. If 25 psi (1.8 kg/cm2 ) or greater does not exist, go to step 9).
  4. Start engine. Warm engine to normal operating temperature. Observe fuel pressure gauge with engine idling. If 30-37 psi (2.1-2.6 kg/cm2 ) does not exist, go to next step. If 30-37 psi (2.1-2.6 kg/cm2 ) exists, check for corroded and poor harness connections at components and repair as necessary.
  5. Check for clogged vacuum passage or collapsed vacuum line to fuel pressure regulator. If problem does not exist, go to step 19). If problem exists, repair as necessary and go to step 21).
  6. If fuel pressure gauge did not indicate any pressure, go to next step. If fuel pressure gauge indicated any pressure, go to step 14).
  7. Crank engine while observing fuel pressure gauge. Check fuel pressure while pinching fuel return line. If no fuel pressure is indicated, go to next step. If any fuel pressure is indicated, go to step 19).
  8. Check fuel feed lines for restriction. If restriction does not exist, go to step 20). If restriction exists, repair as necessary and go to step 19).
  9. Check fuel feed lines for leaks. If leaks do not exist, go to next step. If leaks exists, repair as necessary and go to step 19).
  10. Turn ignition switch to RUN position. Pinch fuel feed hose before pressure regulator. Observe fuel pressure gauge one minute after fuel pump stops running. If 25 psi (1.8 kg/cm2 ) or greater exists, go to next step. If 25 (1.8 kg/cm2 ) psi or greater does not exist, go to step 12).
  11. Check for fuel leak between fuel pump and fuel pipe connection in fuel tank. If leak exists, repair as necessary and go to step 21). If leak does not exist, go to step 20).
  12. Turn ignition switch to RUN position. Observe fuel pressure while pinching fuel return hose. If 25 psi (1.8 kg/cm2 ) or greater does not exist, go to next step. If 25 psi (1.8 kg/cm2 ) or greater exists, go to step 19).
  13. Check for fuel leak at injectors. See FUEL SYSTEM in SYSTEM/COMPONENT TESTS article. If leak does not exist, go to step 20). If leak exists, repair as necessary and go to step 21).
  14. If fuel pressure was less than 36 psi (2.5 kg/cm2 ), go to next step. If fuel pressure was greater than 36 psi (2.5 kg/cm2 ), go to step 17).
  15. Turn ignition switch to RUN position. Observe fuel pressure while pinching fuel return hose. If fuel pressure is less than 57 psi (4.0 kg/cm2 ), go to next step. If fuel pressure is greater than 57 psi (4.0 kg/cm2 ), go to step 19).
  16. Repair plugged fuel filter, leaking fuel line in fuel tank or restricted fuel lines. After repairs are complete, go to step 21).
  17. Turn ignition switch to LOCK position. Relieve fuel pressure. Disconnect fuel return line from fuel rail. Connect a hose to fuel rail. Place hose in approved gasoline container. Turn ignition switch to RUN position while observing fuel pressure. If 36-43 psi (2.5-3.0 kg/cm2 ) exists, go to next step. If 36-43 psi (2.5-3.0 kg/cm2 ) does not exist, go to step 19).
  18. Replace or repair fuel return lines as necessary and go to step 21).
  19. Replace fuel pump pressure regulator and go to step 21).
  20. Replace fuel pump and go to next step.
  21. Operate vehicle under conditions under which original symptom was noted. If system operates normally, system is okay at this time. If system does not operate normally, check for corroded and poor component connections. Repair as necessary.
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