Fuel Pump Control Module (300ZX)

The fuel pump has its own control module. When fuel pump relay is activated, battery voltage is directed through the relay, to fuel pump control module, and to the fuel pump. See FUEL PUMP RELAY (300ZX) . The fuel pump control module adjusts the voltage supplied to fuel pump according to engine conditions. Fuel pump control module supplies approximately 14 volts to the fuel pump under the following conditions:

• 1 second after ignition switch is turned to ON position.
• During engine cranking.
• 30 seconds after engine starts at temperatures greater than 122°F (50°C).
• Engine temperature is less than 50°F (10°C).
• Engine is running under heavy load condition.

Under conditions other than those listed, fuel pump control module limits fuel pump voltage to approximately 8 volts.