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.
System Description
When you turn ON the ignition switch, control module enables fuel pump, relay which powers fuel pump ON. Fuel pump remains ON as long as engine is cranking or running and control module receives ignition reference pulses. If there are no ignition reference pulses, control module shuts fuel pump OFF within 2 seconds after ignition was switched to ON position or if engine stops. Fuel tank stores fuel supply. Electric fuel pump supplies fuel through an in-line fuel filter to fuel injection system. Pump provides fuel at a higher rate of flow than is needed by fuel injection system. Fuel pressure regulator maintains correct fuel pressure to fuel injection system. A separate pipe returns unused fuel to fuel tank.
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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.