Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Pump Operation
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.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.