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 MANUALSCADILLAC1991SEVILLE V8-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTFUEL DELIVERY AND AIR INDUCTIONFUEL PUMPTESTING AND INSPECTION
1991 Cadillac Seville V8-300 4.9L
Fuel Pump: Testing and Inspection
1991 Cadillac Seville V8-300 4.9LSECTION Testing and Inspection
PROCEDURE:
1. Relieve fuel system pressure before fuel feed line disconnection, refer to FUEL SYSTEM PRESSURE RELIEF.
2. Disconnect the fuel feed line at the engine, and connect a hose from the feed line to a suitable unbreakable container.
3. Apply battery voltage to the fuel pump test terminal (terminal "G" of ALDL).
4. The fuel pump should supply 1/2 pint or more of fuel in 15 seconds.
5. If flow is below minimum, check for fuel restrictions.
6. Refer to DIAGNOSTIC CHARTS/FUEL PRESSURE AND INJECTOR FLOW (CHART A-5), for further diagnosis of the electric fuel pump.
RENDER: 1.0x
NO RELATED
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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.