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 Control System
An electric fuel pump (located inside fuel tank) supplies fuel under pressure to TBI unit. A fuel pressure regulator inside TBI unit keeps fuel available to injectors (inside TBI) at a constant pressure. Unused fuel is returned to tank.
The fuel pump is controlled by the ECM through the fuel pump relay. As a back-up system to the fuel pump relay, the fuel pump can also be turned on by an oil pressure switch. If fuel pump relay fails, engine can still be started after oil pressure reaches 4 psi (.3kg/-cm2 ). A defective fuel pump relay can result in long cranking times, particularly in cold weather.
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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.