Sentra Wagon FWD L4-1597cc 1.6L SOHC (E16i) (1988)
Fuel Pressure Regulator: Description and Operation
PRESSURE REGULATOR
The pressure regulator, built into the side of the throttle body, maintains the fuel pressure as follows.
2WD Model: Approximately 98 kPa (1.0 kg/cm2, 14 psi)
4WD Model: Approximately 250.1 kPa (2.55 kg/cm2 , 36.3 psi)
Since the injected fuel amount depends on injection pulse duration, it is necessary to keep pressure constant.