CRX Si L4-1590cc 1.6L SOHC (D16A6) MFI (1988)
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Fuel Pressure Regulator: Description and Operation
The fuel pressure regulator maintains a constant fuel pressure to the injectors. When the difference between fuel pressure and manifold pressure
exceeds 36 psi, the diaphragm is pushed upward, allowing excess fuel to return to the fuel tank.