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 MANUALSSAAB1990900 S, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGFUEL SYSTEMFUEL PRESSURE CHECKFUEL PUMP DELIVERY PRESSURE
1990 Saab 900 S, 2D Hatchback, Automatic
Fuel Pump Delivery Pressure
1990 Saab 900 S, 2D Hatchback, AutomaticSECTION Fuel Pump Delivery Pressure
- Turn ignition on. Pinch off fuel return line, and check line pressure. When line is plugged, there should be an immediate rise in line pressure.CAUTION: DO NOT allow pressure to rise above 83 psi (5.8 kg/cm2 ).
- If line pressure does not increase, check for the following problems:
- At least 11.5 volts across fuel pump terminals.
- Obstructed fuel lines.
- Clogged fuel filter.
- Fuel filter installed backward.
- Defective relief valve in fuel pump.NOTE: If fuel filter has been installed backwards, it must be replaced.
- After checking fuel pump pressure, turn ignition off. Go to FUEL PUMP DELIVERY FLOW test procedure (do not disconnect pressure gauge).
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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.