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Home >> Saab >> 1998 >> 900 SE, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System >> Fuel Pressure >> Fuel Pressure

Fuel Pressure

  1. Begin basic diagnosis of fuel system by measuring system pressure. Turn ignition off. Disconnect banjo coupling at inlet to fuel injection manifold. Connect a fuel pressure gauge, using existing seals. Hang pressure gauge vertically.
  2. Remove fuse No. 32 (15-amp) on 900 Series, or fuse No. 14 (20-amp) on 9000 Series. Connect a fused jumper wire between battery voltage and load side slot of fuse No. 32 on 900 Series, or between fuse No. 22 (15-amp) and load side slot of fuse No. 14 on 9000 Series. This will provide voltage to fuel pump. Turn ignition on.
  3. Fuel pressure should increase to about 43 psi (3.0 kg/cm2 ). If fuel pressure is too high, go to next step. If fuel pressure is too low, go to step 5).
  4. Turn ignition off. Disconnect fuel return line from pressure regulator. 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. Inspect one-way valve at tank. Retest system.
  5. Check fuel level. DO NOT  rely on fuel gauge. Inspect for fuel system leaks. Test fuel pressure regulator. See FUEL PRESSURE REGULATOR  .
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