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 Circuit
When the ignition switch is turned to the "ON" position, the EEC relay closes and as part of its function, supplies current to the fuel pump relay coil circuit. Closing of the fuel pump relay contact completes the circuit to the fuel pumps and a timing device in the EEC module.
If the ignition switch is not turned to the crank position after one second, the timing device will open the fuel pump relay coil ground circuit, allowing the relay contacts to open. This circuit provides for pre-pressurization of the fuel system. The fuel pump circuit is protected by a 15-amp fuse located under the circuit protection panel. See Fig 1 and Figure .
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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.