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 MANUALSPONTIAC1987FIREBIRD FORMULA, 5.0 H, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCEADJUSTMENTTUNE-UP - 2.8L/173" GAS MPI V6 VIN [S]FUEL SYSTEMFUEL PUMP OUTPUT CHECK
1987 Pontiac Firebird Formula, 5.0 H, Automatic
Fuel Pump Output Check
1987 Pontiac Firebird Formula, 5.0 H, AutomaticSECTION Fuel Pump Output Check
- A Schrader valve is located on the fuel rail for easy access to the fuel pressure. See Figure.
- See Fig 1 for fuel feed and return line identification.
- Engine does not have a fuel pump prime connector. Rather, ALDL terminal G is spliced directly into the fuel pump power circuit. Hence, the fuel pump can be manually powered by jumping a power feed to terminal G. See Fig 2.
See chart A-7 to check fuel pressure and diagnose any incorrect fuel pressures. The A-charts are not contained in this article. They can be found in the appropriate article in the ENGINE PERFORMANCE section.
FUEL PUMP PRESSURE/VOLUME SPECIFICATIONS
| Application | Specification | |||
|---|---|---|---|---|
| Pressure | ||||
| No Vacuum @ Reg. | 40.5-47.0 PSI | |||
| Vacuum Line Connected @ Reg. | (1) 34-40 PSI | |||
| Volume | .5 Pnt/15 Sec. | |||
|
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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.