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Home >> Volvo >> 1993 >> 940 Turbo, 4D Sedan, AW71L >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Delivery >> Fuel Pressure Regulator
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Fuel Pressure Regulator

  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 Fig 1 .
  2. Connect a jumper wire between relay terminals No. 30 and 87/2. See Fig 2 . 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.
Fig 1: Locating Fuel System Relay
G91D16645Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Fuel Injection System Relay Terminals
G121539Courtesy of VOLVO CARS OF NORTH AMERICA.
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