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 MANUALSSAAB19939000 CD, 2.3 B, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGFUEL SYSTEMFUEL PRESSUREFUEL PRESSURE REGULATOR
1993 Saab 9000 CD, 2.3 B, Standard
Fuel Pressure Regulator
1993 Saab 9000 CD, 2.3 B, StandardSECTION Fuel Pressure Regulator
- If fuel pressure gauge is already attached, go to next step. If gauge is not attached, disconnect banjo coupling at inlet to fuel injection manifold. Connect fuel pressure gauge at this point, using existing seals. Hang pressure gauge vertically.
- Connect Pressure Gauge (83-93-514 ) and "Y" connection to vacuum port of fuel pressure regulator. Hang pressure gauge vertically. Connect cooling system pressure tester to "Y" connection.
- Turn ignition off. Remove fuse No. 30 on 900 Series or fuses No. 14 and 22 on 9000 Series. Connect jumper lead between fuse No. 27, 28 or 29 and slot of fuse No. 30 on 900 Series, or between fuse No. 22 and slot of fuse No. 14 on 9000 Series. This will provide current to fuel pump. Turn ignition on.
- Fuel pressure should increase to about 36-43 psi (2.5-3.0 kg/cm2 ). Using a cooling system pressure tester, increase system pressure as specified in REGULATED FUEL PRESSURE (PRESSURE APPLIED) table. Compare fuel pressure to specification.
- Remove cooling system pressure tester. Install vacuum pump to "Y" connection. Fuel pressure should be about 36-43 psi (2.5-3.0 kg/cm2 ). Use vacuum pump to reduce system pressures as specified in the REGULATED FUEL PRESSURE (VACUUM APPLIED) table. Compare fuel pressure to specification. Disconnect vacuum pump.
- Turn ignition on to operate fuel pump. Verify fuel pressure is 36-43 psi (2.5-3.0 kg/cm2 ). Turn ignition off. Pressure should drop 1.4-2.8 psi (.1-.2 kg/cm2 ) and then hold steady for at least 10 minutes.
- If pressure drop is more than specified, check for leakage in pressure regulator and fuel pump nonreturn valve.REGULATED FUEL PRESSURE (PRESSURE APPLIED)
Applied Pressure: psi (kg/cm2 ) Line Pressure: psi (kg/cm2 ) 0 (0) 36 (2.5) 2.8 (0.2) 38 (2.7) 5.7 (0.4) 41 (2.9) 8.5 (0.6) 44 (3.1) REGULATED FUEL PRESSURE (VACUUM APPLIED)Applied Vacuum: In. Hg Line Pressure: psi (kg/cm2 ) 0 36 (2.5) 5 33 (2.3) 11 30 (2.1) 16 27 (1.9)
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.