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.
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HOMESERVICE MANUALSTOYOTA1992CAB & CHASSIS STANDARD, R150REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTING - V6FUEL SYSTEMFUEL PUMP OPERATION
1992 Toyota Cab & Chassis Standard, R150
Fuel Pump Operation
1992 Toyota Cab & Chassis Standard, R150SECTION Fuel Pump Operation
- Install jumper wire between +B and FP terminals of engine check connector. See Fig 1 & 2. Turn ignition on.
- Listen for fuel pump operating sound and feel for pressure in fuel line near the fuel filter. Turn ignition off. Remove jumper wire. If fuel pump operates, check fuel pressure. See FUEL PRESSURE under FUEL SYSTEM.
- If fuel pump does not operate, connect a jumper wire from battery source to FP terminal of engine check connector. If fuel pump operates, the EFI main relay, circuit opening relay or fuel pump relay may be defective. For explanation of relay operation, see FUEL PUMP CONTROL CIRCUIT under FUEL SYSTEM.
- If relays are okay, check wiring circuit and fuses. If fuel pump does not operate, check for defective fuel pump or open circuit between engine check connector and fuel pump, defective fuel pump ground or fuses. See appropriate wiring diagram in WIRING DIAGRAMS article in ENGINE PERFORMANCE.
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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.