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 MANUALSSAAB1994900 SE, 4D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGFUEL SYSTEMFUEL PRESSUREFUEL PRESSURE
1994 Saab 900 SE, 4D Hatchback, Automatic
Fuel Pressure
1994 Saab 900 SE, 4D Hatchback, AutomaticSECTION Fuel Pressure
- Turn ignition off. Disconnect banjo coupling at inlet to fuel injection manifold. Connect a fuel pressure gauge, using existing seals. Hang pressure gauge vertically.
- Remove fuse No. 32 on 900 Series, or fuse No. 14 on 9000 Series. Connect a fused jumper lead between battery voltage and load side slot of fuse No. 32 on 900 Series, or between fuse No. 22 and load side slot of fuse No. 14 on 9000 Series. This will provide current to fuel pump. Turn ignition on.
- Fuel pressure should increase to about 43 psi (3.0 kg/cm2 ). If fuel pressure is too high, go to next step. If fuel pressure is too low, go to step 5).
- Turn ignition off. Disconnect fuel return line from pressure regulator. Blow through line. If line is open, pressure regulator is defective and should be replaced. If line is blocked, remove blockage or replace with a new return line. Inspect one-way valve at tank, and retest system.
- Check fuel level; DO NOT rely on fuel gauge. Inspect for fuel system leaks. Test fuel pressure regulator. See FUEL PRESSURE REGULATOR .
RENDER: 1.0x
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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.