SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET1999LUMINA LTZ, 3.8 KREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - BASIC ENGINE TESTINGNO START DIAGNOSISNO START - ENGINE CRANKS OKAY (3.8L)FUEL SYSTEM ELECTRICAL CIRCUIT (VIN K)
1999 Chevrolet Lumina LTZ, 3.8 K

Fuel System Electrical Circuit (VIN K)

1999 Chevrolet Lumina LTZ, 3.8 KSECTION Fuel System Electrical Circuit (VIN K)
  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. Remove fuel pump relay. Using a fused jumper wire, jumper fuel pump feed circuit at fuel pump relay connector to battery positive. See appropriate wiring diagram in WIRING DIAGRAMS article. Observe fuel pressure. Fuel pressure should be 48-55 psi (3.4-3.8 kg/cm2 ). If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to step  10 .
  3. Disconnect jumper wire from fuel pump relay connector. Connect test light between ignition feed circuit and ground circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Turn ignition on and observe test light. If test light illuminates, go to next step. If test light does not illuminate, go to step  9 .
  4. Turn ignition off. Connect test light between fuel pump relay control circuit and ground circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Observe test light while turning ignition on. Test light should illuminate for about 2 seconds. If test light illuminates for about 2 seconds, go to step  8 . If test light does not illuminate for about 2 seconds, go to next step.
  5. Turn ignition off. Disconnect Powertrain Control Module (PCM) harness connectors. Using a test light connected to battery positive, probe PCM harness connector fuel pump relay control circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step  15 . If test light does not illuminate, go to next step.
  6. Check for continuity in fuel pump relay control circuit between fuel pump relay and PCM. See appropriate wiring diagram in WIRING DIAGRAMS article. If circuit is faulty, repair as necessary. After repairs, go to step  21 . If circuit is okay, go to next step.
  7. Check fuel pump relay control circuit for poor terminal connection at PCM. See appropriate wiring diagram in WIRING DIAGRAMS article. If connection is faulty, repair as necessary. After repairs, go to step  21 . If circuit is okay, go to step  20 .
  8. Check for poor terminal connection at fuel pump relay. If connection is faulty, repair as necessary. After repairs, go to step  21 . If connections are okay, go to step  18 .
  9. Using a test light connected to ground, probe fuel pump relay connector ignition feed circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step  17 . If test light does not illuminate, go to step  16 .
  10. Remove fuel filler cap and listen for fuel pump running. If fuel pump is running, diagnose fuel system. See BASIC FUEL SYSTEM CHECKS  . If fuel pump is not running, go to next step.
  11. Using a fused jumper wire, jumper fuel pump feed circuit at fuel pump relay connector to battery positive. See appropriate wiring diagram in WIRING DIAGRAMS article. Raise and support vehicle. Disconnect fuel sending unit harness connector at fuel tank. Connect test light between fuel pump feed circuit and fuel pump ground circuit at fuel sending unit harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step  19 . If test light does not illuminate, go to next step.
  12. Using a test light connected to chassis ground, probe fuel pump feed circuit at fuel sending unit harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step  14 . If test light does not illuminate, go to next step.
  13. Locate and repair open in fuel pump feed circuit. After repairs, go to step  21 .
  14. Locate and repair open in fuel pump ground circuit. After repairs, go to step  21 .
  15. Locate and repair short to ground in fuel pump relay control circuit. After repairs, go to step  21 .
  16. Locate and repair open or short to ground in ignition feed circuit to fuel pump relay. After repairs, go to step  21 .
  17. Locate and repair open in ground circuit to fuel pump relay. After repairs, go to step  21 .
  18. Replace fuel pump relay. After replacing fuel pump relay, go to step  21 .
  19. Replace fuel pump. After replacing fuel pump, go to step  21 .
  20. Replace PCM. Perform PCM relearn procedures. After replacing PCM, go to next step.
  21. Turn ignition on. Using scan tool, select FP RELAY OUTPUT CONTROL function. Observe fuel pressure gauge while commanding fuel pump on with scan tool. Fuel pressure should be 48-55 psi (3.4-3.8 kg/cm2 ). If fuel pressure is not as specified, go to step  2 . If fuel pressure is as specified, system is okay.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.