LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saab >> 2000 >> 9-3 Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System >> Fuel Pressure/Flow Tests >> Fuel Pressure Regulator
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fuel Pressure Regulator

NOTE: When testing fuel pressure regulator, fuel pressure should drop or increase in direct proportion to vacuum or pressure applied to fuel pressure regulator diaphragm.
  1. If fuel pressure gauge is already attached, go to next step. If gauge is not attached, on 9-3, connect gauge to service fitting or on 9-5, disconnect banjo coupling at inlet to fuel injection manifold. Connect fuel pressure gauge at this point, using existing seals. On both models, hang pressure gauge vertically.
  2. Remove vacuum hose from fuel pressure regulator and connect vacuum/pressure gauge to vacuum port. Connect TECH-2 scan tool to Data Link Connector (DLC). Use scan tool to activate fuel pump.
  3. Fuel pressure should increase to about 43 psi (3.0 kg/cm2 ). Use vacuum pump to reduce system pressures as specified in REGULATED FUEL PRESSURE (VACUUM APPLIED)  table. Compare fuel pressure to specification. Go to next step.
    REGULATED FUEL PRESSURE (VACUUM APPLIED)

    Applied Vacuum In. Hg Fuel Pressure psi (kg/cm2 )
    0 43 (3.0)
    5 40.5 (2.9)
    10 38 (2.7)
    15 35.5 (2.5)
  4. Increase pressure as specified in REGULATED FUEL PRESSURE (PRESSURE APPLIED)  table. Compare fuel pressure to specification. If fuel pressure is not as specified, replace fuel pressure regulator and retest system.
    REGULATED FUEL PRESSURE (PRESSURE APPLIED)

    Applied Pressure psi (kg/cm2 ) Fuel Pressure psi (kg/cm2 )
    0 (0) 43 (3.0)
    3.0 (0.2) 46 (3.3)
    6.0 (0.4) 49 (3.5)
    8.5 (0.6) 51.5 (3.9)
scientia non olet · About LEMON Manuals