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 MANUALSPONTIAC1987FIERO GT, STANDARD, MG3REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMV6/V8 PFI COMPONENT TESTCHART A7 - FUEL SYSTEM DIAGNOSIS (2.8L)CHART A7 (2 OF 2) - FUEL SYSTEM DIAGNOSIS (2.8L)
1987 Pontiac Fiero GT, Standard, MG3
Chart A7 (2 Of 2) - Fuel System Diagnosis (2.8L)
1987 Pontiac Fiero GT, Standard, MG3SECTION Chart A7 (2 Of 2) - Fuel System Diagnosis (2.8L)
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- If fuel pressure is less than 40 psi (2.8 kg/cm2
) check the following:
- System has regulated pressure but pressure is less than 40 psi (2.8 kg/cm2 ). The Amount of fuel to the injectors is okay, but fuel pressure is too low. Fuel system will be lean running and may set Code 44. Also, vehicle is hard starting cold and has overall poor performance.
- Restricted fuel flow that causes pressure drop. Normally a vehicle with a fuel pressure of less than 24 psi (1.6 kg/cm2 ) at idle will not be driveable. However, if the pressure drop occurs only while driving, the engine will normally surge then stop as pressure begins to drop rapidly.
- Restricting the fuel return line allows the fuel pump to develop its maximum pressure (dead head pressure). When battery voltage is applied to the pump test terminal, pressure should be above 60 psi (4.1 kg/cm2 ).
- This test determines if the high fuel pressure is due to a restricted fuel return line or a pressure regulator problem.
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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.