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, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGFUEL SYSTEMFUEL PRESSURE CHECKFUEL PUMP DELIVERY FLOW
1990 Saab 900 Base, 2D Convertible, Automatic
Fuel Pump Delivery Flow
1990 Saab 900 Base, 2D Convertible, AutomaticSECTION Fuel Pump Delivery Flow
- Turn ignition off. Disconnect fuel return line at pressure regulator. Connect a section of test hose to return line at pressure regulator. Place other end of test hose in graduated container of about 2 quarts.
- Activate fuel pump by turning ignition on. Run fuel pump for 30 seconds. Check volume of fuel flow and fuel pressure drop. Minimum acceptable volume is .95 qts. (.9 L), and maximum allowed fuel pressure drop is 1.4-2.8 psi (.1-.2 kg/cm2 ). If fuel volume or pressure drop does not meet specification, replace fuel pressure regulator.
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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.