If the engine will crank but not start, it may be the fuel pump has failed. Diagnosis may find no fuel pressure when attempting to start the engine.Google+
Car Problem Reports
Saab 9-3 Crank but No Start Condition and No Fuel Pressure
Saab 9-3 Problem
Engines Affected: 2.0L 4 Cylinder Turbo, 2.3L 4 Cylinder Turbo
Average Mileage: 130,000 mi (122,000 mi - 135,000 mi)
Visitor, 2000 Saab 9-3, 2.0L 4 Cylinder Turbo, 135,000 mi
Fuel pump went, was replaced after being towed.
Visitor, 1999 Saab 9-3, 2.0L 4 Cylinder Turbo, 122,000 mi
Car died in the middle of the street, cranked but wouldn't turn over. diagnosed as faulty fuel pump, replaced.
Visitor, 2006 Saab 9-3, 2.0L 4 Cylinder Turbo
This happened to me on a rainy humid day that the car had not been driven for 3 days. It appeared that the humidity was affecting the starter because after several attempts, some rest (thinking that the starter was dead), and one last attempt, the engine started no problem . Thank god I gave it some time before calling the tow truck.