Fuel Pump Operation

NOTE: Ensure battery is fully charged, and all related fuses in fuel system are in good condition before starting any fuel system diagnosis.

Fuel pump is electric in-tank type. Remove fuel filler cap. To operate fuel pump, jumper DLC terminals FUEL PUMP and (B+). On Optima & Magentis (Canadian), DLC is located on left side under dash. On models except Optima & Magentis (Canadian), DLC is located on left side of engine compartment. See Figure-Figure . Turn ignition on and listen at fuel filler neck for fuel pump operation sound. If fuel pump operation sound is not heard, do the following:

Check fuel system relays. See FUEL SYSTEM RELAYS for proper relay operation. If relays are operating properly, go to next step. If relays are not operating properly, replace relays as necessary.
Check for battery voltage and good ground at fuel pump harness connector. For fuel pump harness connector identification, location and circuit testing, see WIRING DIAGRAMS article. If battery voltage and ground are found acceptable, go to next step. If battery voltage or ground is not found acceptable, repair or replace wiring and connectors as necessary.
After fuel system fuses, relays, wiring and connectors check at good operating condition, replace electric in-tank type fuel pump. For fuel pump replacement, see FUEL PUMP under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article.