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.
Chart A-7, Fuel System Diagnosis: Notes
With ignition on, the ECM activates fuel pump relay, which energizes the in-tank electric fuel pump. The fuel pump operates as long as ECM receives an ignition reference pulse. If there is no ignition reference pulse, fuel pump stops within 2 seconds.
The fuel pump delivers fuel to the TBI unit, where pressure is controlled at 9-13 psi. Excess fuel is returned to fuel tank. The fuel pump test terminal is located on the right side of engine compartment. When engine is stopped, fuel pump can be turned on by applying battery voltage to test terminal.
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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.