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 MANUALSBUICK1991CENTURY L4-151 2.5L VIN R TBIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOIL PRESSURE SENSORTESTING AND INSPECTION
1991 Buick Century L4-151 2.5L VIN R TBI
Oil Pressure Sensor: Testing and Inspection
1991 Buick Century L4-151 2.5L VIN R TBISECTION Testing and Inspection
Wiring Diagram For Fuel Pump Relay.:
The oil pressure switch is mounted on the engine. This switch operates as a parallel power supply with the fuel pump relay to supply battery voltage to the fuel pump. Voltage is supplied to the fuel pump after approximately 28 kPa (4 PSI) oil pressure is reached.
RENDER: 1.0x
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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.