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 Test
Remove fuel tank filler cap. Turn ignition on. Listen for fuel pump operating noise. If noise is not present, check fuel pump relay and wiring harness between relay and pump. On Q45, check operation of fuel pump control unit. If okay, disconnect fuel pump/sender connector at fuel tank and check resistance across fuel pump winding terminals. See FUEL PUMP WINDING IDENTIFICATION table. Ohmmeter should read .5 ohm. If resistance is not correct, replace fuel pump.
| Model | Wire Colors |
|---|---|
| M30 | White & Blue |
| Q45 | White & Orange/Blue |
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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.
- • 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.
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