323 L4-1800cc 1.8L OHC (1991)
PRC solenoid valve, which blocks manifold vacuum to the pressure regulator and vents the regulator diaphragm chamber to the atmosphere. With
atmospheric pressure at the diaphragm, fuel pressure is increased. Increasing fuel pressure helps reduce fuel percolation due to heat. The PRC solenoid is
energized for about 50 seconds after the engine is started. After this time, the PRC solenoid is turned "OFF" and normal vacuum modulation of fuel
system pressure is resumed.
