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HOMESERVICE MANUALSCHEVROLET1999PICKUP K1500, 5.7 RREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURESNO START DIAGNOSISNO START-ENGINE CRANKS OKAY (4.3L, 5.0L, 5.7L & 7.4L)FUEL SYSTEM ELECTRICAL CIRCUIT
1999 Chevrolet Pickup K1500, 5.7 R

Fuel System Electrical Circuit

1999 Chevrolet Pickup K1500, 5.7 RSECTION Fuel System Electrical Circuit
  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. If fuel pump runs continuously, go to step  26. If fuel pump does not run, go to next step.
  3. Inspect ECM B fuse (20-amp), located in underhood fuse/relay center. If fuse is okay, go to next step. If fuse is open, go to step  21.
  4. Turn ignition on. Install scan tool. Using scan tool, command fuel pump relay on. If fuel pump operates, go to IGNITION SYSTEM . If fuel pump does not operate, go to next step.
  5. Remove fuel pump relay. Using a fused jumper wire, jumper fuel pump positive feed circuit to fuel pump relay ignition feed circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If fuel pump operates, go to next step. If fuel pump does not operate, go to step  7.
  6. Using a test light connected to ground, probe fuel pump relay control circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Using scan tool, command fuel pump on. If test light illuminates, go to step  8. If test light does not illuminate, go to step  9.
  7. Using a test light connected to ground, probe ignition feed circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step  10. If test light does not illuminate, go to step  11.
  8. Using a test light connected to battery positive, probe ground circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step  12. If test light does not illuminate, go to step  13.
  9. Check for an open or short to ground in fuel pump relay control circuit. Repair as necessary. After repairs, go to step  31. If circuit is okay, go to step  14.
  10. Reinstall fuel pump relay. Disconnect fuel pump harness connector. Using a test light connected to ground, probe fuel pump positive feed circuit at fuel pump harness connector (body harness side). See appropriate wiring diagram in WIRING DIAGRAMS article. Using scan tool, command fuel pump on. If test light illuminates, go to step  15. If test light does not illuminate, go to step  16.
  11. Repair open in fuel pump relay ignition feed circuit. After repairs, go to step  31.
  12. Replace fuel pump relay. After repairs, go to step  31.
  13. Repair open in fuel pump relay ground circuit. After repairs, go to step  31.
  14. Check for poor connections at VCM. Repair as necessary. After repairs, go to step  31. If connections are okay, go to step  17.
  15. Using a test light connected to battery positive, probe ground circuit at fuel pump harness connector (body harness side). See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step  18. If test light does not illuminate, go to step  19.
  16. Repair open or short to ground in fuel pump positive feed circuit. After repairs, go to step  31.
  17. Replace VCM. Perform VCM relearn procedures. After repairs, go to step  31.
  18. Check fuel pump positive feed and ground circuits at fuel pump harness connector for poor connections. Repair as necessary. After repairs, go to step  31. If connections are okay, go to step  20.
  19. Repair open in fuel pump ground circuit. After repairs, go to step  31.
  20. Replace fuel pump. After repairs, go to step  31.
  21. Turn ignition off. Disconnect fuel pump harness connector. Remove fuel pump relay. Using a test light connected to battery positive, probe fuel pump positive feed circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step  23.
  22. Repair short to ground in fuel pump positive feed circuit. After repairs, go to step  31.
  23. Using a test light connected to battery positive, probe ignition positive feed circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step  25.
  24. Repair short to ground in fuel pump relay ignition feed circuit. After repairs, go to step  31.
  25. Check fuel pump positive feed circuit in fuel pump wiring harness (tank side) for a short to ground. Repair as necessary. After repairs, go to step  31. If circuit is okay, go to step  20.
  26. Remove fuel pump relay. If fuel pump continues to run, go to step  30. If fuel pump does not run, go to next step.
  27. Turn ignition off. Using a test light connected to ground, probe fuel pump relay control circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step  29. If test light does not illuminate, go to next step.
  28. Replace fuel pump relay. After repairs, go to step  31.
  29. Repair fuel pump relay control circuit for a short to ground. After repairs, go to step  31.
  30. Repair fuel pump positive feed circuit for a short to power. After repairs, go to step  31.
  31. Using scan tool, clear DTCs. Attempt to start engine. If engine starts and continues to run, go to next step. If engine does not start, go to step  4.
  32. Allow engine to reach normal operating temperature. Using scan tool, check for DTCs. If any DTCs are present, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If no DTCs are present, system is okay.
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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.
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  • • 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.