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Home >> Saab >> 1985 >> 900 S, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Turbo >> Testing >> Fuel Line Pressure

Fuel Line Pressure

  1. Disconnect banjo coupling at inlet to fuel injection manifold. Connect a fuel pressure gauge using existing seals. Ensure pressure gauge hangs vertically.
  2. Turn ignition off. Remove fuse number 30. Connect a jumper lead between fuse 27, 28, or 29 and slot of fuse 30, to provide current to fuel pump. Turn ignition on.
  3. Line pressure should rise to about 36.3 psi (2.57 kg/cm2 )). If line pressure is too high, go to step 4). If line pressure is too low, got to step 5).
  4. Turn ignition off. Disconnect fuel return line from pressure regulator and blow in line. If line is open, pressure regulator is defective and should be replaced. If line is blocked, unblock, or replace with a new return line. Check one-way valve at tank, and retest system.
  5. Check fuel level, do not rely on fuel gauge. Check for fuel system leaks. Check fuel pressure regulator. See FUEL PRESSURE REGULATOR  .
NOTE: If proceeding to FUEL PRESSURE REGULATOR test, do not remove fuel pressure gauge.
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