Mazda RX-7 Pressure Regulator Control System Wiring Diagram The following schematic shows the 1990 Mazda RX-7 System . 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, (ECU), pressure regulator, water thermo sensor, intake air thermo sensor.

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