Mazda RX-7 Pressure Regulator Control System Wiring Diagram The following schematic shows the 1990 Mazda RX-7 Pressure Regulator Control System Wiring Diagram. This system prevents percolation of the fuel during idle after the engine is restarted, vacuum is cut to the pressure regulator increasing the fuel pressure. This system consists of: battery, ignition switch, main relay, engine control unit (ECU), pressure regulator, water thermo sensor, intake air thermo sensor.



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