FUEL PUMP OPERATION
Note. Ensure battery is fully charged, and all related fuses in fuel system are in good condition before start any fuel system diagnose.
Fuel pump is electric in-tank type. Remove fuel filler cap. To operate fuel pump, jumper DLC terminals FUEL PUMP and (B+). DLC on Optima & Magentis (Canadian), is located on left side under dash. On all other models DLC is located on left side of engine compartment. see scheme 40- see scheme 42. 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 appropriate «RELAYS & SOLENOIDS»(ref-133266-S07889557092002052100000) 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 also 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.
System Components Identification
For fuel evaporation system components identification and location see scheme 63
