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 MANUALSPONTIAC1990FIREBIRD TRANS AM, 5.0 F, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGBASIC FUEL SYSTEM CHECKSFUEL PUMP TESTS (CARBURETED)FUEL PUMP TEST 2
1990 Pontiac Firebird Trans Am, 5.0 F, Standard
Fuel Pump Test 2
1990 Pontiac Firebird Trans Am, 5.0 F, StandardSECTION Fuel Pump Test 2
Connect a short section of hose and a vacuum gauge to fuel pump inlet side. Start or crank engine until maximum vacuum reading is obtained. Vacuum reading should be 15 in. Hg.
NOTE:
If fuel pump fails both Tests 1 and 2, replace fuel pump. If fuel pump failed Test 1 and passes Test 2, check fuel hoses and replace as necessary. If pump and hoses are okay and fuel delivery is still insufficient, remove fuel tank and inspect fuel tank strainer.
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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.