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Home >> Volvo >> 1994 >> 940 Base, 4D Sedan, AW71 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Delivery >> Fuel Pressure Regulator (940)

Fuel Pressure Regulator (940)

  1. Connect Fuel Pressure Gauge (5011 ) between fuel line and fuel rail. Seal free end of hose with Plug (5266 ). Start fuel pumps. Lift out central electrical unit and remove system relay. See Figure .
  2. Connect a jumper wire between relay terminals No. 30 and 87/2. See Figure . Remove fuses No. 30 and 31. See Figure . Connect a jumper wire between right fuse terminals. See Figure . Fuel pumps should start. Fuel filler cover can be removed to determine whether main pump is operating.
  3. Fuel pressure should be 42 psi (3 kg/cm2 ). If pressure is too low, pinch return hose by hand and check whether pressure rises. Do not allow pressure to exceed 86 psi (6 kg/cm2 ). If pressure rises rapidly, replace pressure regulator.
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