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Home >> Nissan-Datsun >> 2004 >> Pathfinder SE, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> Basic Service Procedure >> Fuel Pressure Regulator Check
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Fuel Pressure Regulator Check

  1. Stop engine and disconnect fuel pressure regulator vacuum hose from vacuum gallery.
  2. Plug vacuum gallery with a blind cap.
  3. Connect variable vacuum source to fuel pressure regulator.
    Fig 1: Checking Fuel Pressure Regulator
    G00334229Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Start engine and read indication of fuel pressure gauge as vacuum is changed.
    Fig 2: Identifying Fuel Pressure Gauge As Vacuum Is Change
    G00334230Courtesy of NISSAN MOTOR CO., U.S.A.

Fuel pressure should decrease as vacuum increases. If results are unsatisfactory, replace fuel pressure regulator. 

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