Saab 9-3 Problem Report
Saab 9-3 Extended Cranking to Start Engine
The fuel pump check valve may have failed if the engine requires more cranking before it starts. The check valve is a one way valve that maintains the pressure in the fuel lines so the engine is easier to start after it has sat a while.
Long crank time, especially after running in hot weather, similar to vapor lock. Checked fuel pressure at shrader valve on fuel rail and found when turning key to run position (no cranking), the pressure rises to 45 psi and drops to zero immediately. To eliminate the hassle of dropping my tank and breaking any fuel line links or retaining clips while trying to replace the original check valve, I replaced the banjo bold leading into the fuel filter with one that has a check valve built into it. For my 2001 9-3 SE, the bolt is a 14M x 1.5 pitch. I used BMW part # 32416781261. It is a one-way check valve of the right dimensions, flowing in the proper direction and comes with 2 copper crush type washers. The BMW application is for newer model power steering units but it has worked perfectly in this application on my car for the past 2 months. Fuel pressure is not reduced, even at WOT and the car starts within 2 or 3 seconds of cranking regardless of temperature or how long it has been sitting. - Visitor
If the engine will crank but not start, it may be the fuel pump has failed. Diagnosis may find...
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