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

   Courtesy 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

   Courtesy of NISSAN MOTOR CO., U.S.A.

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