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 MANUALSMAZDA1991323 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGFUEL SYSTEM (FUEL INJECTION)FUEL PUMP CIRCUIT (EXCEPT NAVAJO)
1991 Mazda 323 Base, Standard
Fuel Pump Circuit (Except NAVAJO)
1991 Mazda 323 Base, StandardSECTION Fuel Pump Circuit (Except NAVAJO)
- Turn ignition on. Connect terminals of Yellow fuel pump check connector with a jumper wire. See FUEL PUMP CHECK CONNECTOR (YELLOW) LOCATIONS TABLE . On Miata, Navajo, Protege and 323, attach jumper wire to test connector terminal Fp and to ground in the diagnostic connector, next to battery.
- Listen for fuel pump operating sound. If there is no sound, check main fuse, circuit operating relay, fuel pump and all electrical connections. On all models, airflow meter grounds circuit opening relay and operates fuel pump whenever airflow is present.
- Circuit opening relay and fuel pump relay are controlled by the computer. For additional testing, see I - SYS/COMP TESTS or appropriate G - TEST W/ CODES article in the ENGINE PERFORMANCE section.
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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.