300ZX V6-2960cc 3.0L SOHC MFI (VG30E) (1988)
Vacuum/fuel Pressure Test
8. Connect variable vacuum source to fuel pressure regulator.
9. Jump No. "108" connector of Electronic Control Unit to body ground.
10. Turn ignition switch to "ON" and read the indication of the fuel pressure gauge as the vacuum is changed.
NOTE: Fuel pressure should decrease as vacuum increases. If results are unsatisfactory, replace the fuel pressure regulator.