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 MANUALSPONTIAC1990GRAND PRIX STE, 3.1 VREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGBASIC FUEL SYSTEM CHECKSFUEL PUMP TESTS (CARBURETED)FUEL PUMP TEST 1
1990 Pontiac Grand Prix STE, 3.1 V
Fuel Pump Test 1
1990 Pontiac Grand Prix STE, 3.1 VSECTION Fuel Pump Test 1
Connect a section of hose to fuel pump outlet line. Place end of hose into a unbreakable graduated container. Start engine and idle for 15 seconds. Fuel pump should deliver 1/2 pint of fuel in 15 seconds.
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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.