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Fuel Delivery System

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  1. If fuel pressure is present but out of specification, diagnose fuel system. See FUEL SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article. If fuel pressure is not present, check FUEL PUMP fuse (15-amp) located in underhood fuse block. Replace as necessary and retest. If fuse is okay, go to next step. If fuse continuously blows, repair short to ground in fuel pump relay battery feed circuit or fuel pump power feed circuit.
  2. Turn ignition on. Remove fuel pump relay located in underhood fuse block. Install a known-good relay, or jumper fuel pump relay battery feed circuit and fuel pump power feed circuit together at relay cavities. Using scan tool, command fuel pump relay on. If fuel pump runs, terminal connections or fuel pump relay are faulty. If fuel pump does not run, go to next step.
  3. Connect test light between fuel pump relay ground circuit and fuel pump relay battery feed circuit at relay cavities in fuse block. If test light illuminates, go to next step. If test light does not illuminate, repair open battery feed circuit.
  4. Turn ignition on. Connect scan tool. Raise and support vehicle. Disconnect 8-pin fuel tank unit in-line harness connector. Connect test light between fuel pump power feed circuit and fuel pump ground circuit at in-line harness connector (engine side). Using scan tool, command fuel pump relay on. If test light illuminates, terminal connections, fuel pump harness or fuel pump are faulty. Repair as necessary. If test light does not illuminate, go to next step.
  5. Connect test light between chassis ground and fuel pump power feed circuit at fuse block. Using scan tool, command fuel pump relay on. If test light illuminates, repair open in fuel pump ground circuit. If test light does not illuminate, repair open in fuel pump battery feed circuit.
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