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 DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - BASIC TESTINGBASIC FUEL SYSTEM CHECKSFUEL SYSTEM PRESSURE TEST (EFI)FUEL PRESSURE CHECK (PFI)
1990 Pontiac Grand Prix STE, 3.1 V
Fuel Pressure Check (PFI)
1990 Pontiac Grand Prix STE, 3.1 VSECTION Fuel Pressure Check (PFI)
- Relieve fuel pressure as previously described in FUEL PRESSURE RELIEF (PFI). Connect Fuel Pressure Gauge (J-34730-1) to fuel pressure fitting on fuel rail.
- With gauge installed at fuel rail connector, turn ignition on. With ignition on and engine off, pressure should read within specification. See SPECIFICATIONS - 4-CYL article (for 4-cylinder models), See SPECIFICATIONS - V6 article (for V6 models),See SPECIFICATIONS - V8 article (for V8 models). Start engine. Pressure should drop 3-10 psi (.2-7 kg/cm2 ). For more details on fuel system pressure testing, see SYSTEM/COMPONENT TESTS article.
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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.