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 Control
The ECM controls the operation of the fuel pump through the fuel pump control unit, based on signals from the crankshaft position sensor. To improve safety, a "fuel pump stop signal" is sent from the ECM to the fuel pump control unit to stop the fuel pump if the engine stalls while the ignition switch is ON.
| Ignition switch ON | Fuel pump relay | Fuel pump |
|---|---|---|
| A certain period of time after ignition switch is turned ON | ON | Operates |
| While cranking the engine | ON | Operates |
| While engine is operating | ON | Operates |
| When engine stops | OFF | Does not operate |
Use the Manual With the Right Hardware
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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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