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Home >> Lincoln >> 1989 >> Mark VII LSC >> Repair and Diagnosis >> Engine Performance >> Adjustment >> Tune-Up - V8 >> Fuel System >> Fuel Pump >> Fuel Injected Models

Fuel Injected Models

  1. Release fuel pressure prior to disconnecting any fuel lines. Remove fuel filler cap. Attach a fuel pressure gauge to pressure relief valve on fuel rail. Release fuel pressure through fuel gauge into a container.
  2. Disconnect fuel return line at fuel rail. Connect fuel hose to fuel container. Connect fuel pressure gauge at pressure relief valve on fuel rail. Install jumper wire to FP lead of VIP test connector. See Fig 1 . Turn ignition on. Ground jumper wire to FP lead. Note fuel pump pressure. See FUEL PUMP SPECIFICATIONS  table.
Fig 1: Fuel Pressure Check Procedure
G54227Courtesy of FORD MOTOR CO.
FUEL PUMP SPECIFICATIONS

Application Specification
Pressure
Carbureted Models 6-8 psi (.42-.56 kg/cm2 )
Fuel Injected Models (1) 35-45 psi (2.5-3.2 kg/cm2 )
Volume
Carbureted Models 1 Pt. (.5L) in 20 seconds
Fuel Injected Models 1.5 Pts. (.72L) in 30 seconds
(1) Key on, engine off. Engine running pressure may be 5 psi (.4 kg/cm2 ) less.
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