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 BASE, 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGFUEL SYSTEMFUEL PRESSURE CHECKFUEL LINE PRESSURE
1990 Saab 900 Base, 2D Convertible, Standard
Fuel Line Pressure
1990 Saab 900 Base, 2D Convertible, StandardSECTION Fuel Line Pressure
- Disconnect banjo coupling at inlet to fuel injection manifold. Connect a fuel pressure gauge using existing seals. Ensure pressure gauge hangs vertically.
- Turn ignition off. Remove fuse No. 30 on 900 models. Remove fuse No. 14 and No. 22 from 9000 models. Connect a jumper lead between fuse No. 27, 28, or 29 and slot of fuse No. 30 for 900 models. Connect the jumper between fuse No. 22 and slot of fuse No. 14 on 9000 models. This will provide current to the fuel pump. Turn ignition on.
- Line pressure should rise to approximately 36 psi (2.5 kg/cm2 ). If line pressure is too high, go to next step. If line pressure is too low, go to step 5).
- Turn ignition off. Disconnect fuel return line from pressure regulator and 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. Check one-way valve at tank, and retest system.
- Check fuel level, do not rely on fuel gauge. Check for fuel system leaks. Check fuel pressure regulator. See FUEL PRESSURE REGULATOR test. If proceeding to FUEL PRESSURE REGULATOR test, do not remove fuel 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.