- Location
- Melbourne
- First Name
- Ed
- Drive
- 2000 Legnum VR4 Manual, Ford Territory family runabout, BMW K1300R.
For anyone that cares, I dug up a wiring diagram for an Evo that matches the wiring of the Legnum dual-speed fuel pump relay.
This is from an Evo 5, but it's identical to the Legnum/Galant. The "Fuel Pump Relay No. 2" is mounted to the Firewall of the car and has a rubber boot over it. It is a 5-pin relay that switches between two different circuit paths rather than just open and close a circuit. The ECU either controls this relay to force power to the fuel pump via the path with a resistor in it, or via the direct path that has no resistance. The resistor reduces the volts which reach the motor which in turn lowers the speed of the pump. As this is a high amperage circuit, you can tell that the resistor is the big square with the heatsink on it located right next to the fuel pump.
Just ignore the fact that mine is painted a nifty shade of cyan.
This is from an Evo 5, but it's identical to the Legnum/Galant. The "Fuel Pump Relay No. 2" is mounted to the Firewall of the car and has a rubber boot over it. It is a 5-pin relay that switches between two different circuit paths rather than just open and close a circuit. The ECU either controls this relay to force power to the fuel pump via the path with a resistor in it, or via the direct path that has no resistance. The resistor reduces the volts which reach the motor which in turn lowers the speed of the pump. As this is a high amperage circuit, you can tell that the resistor is the big square with the heatsink on it located right next to the fuel pump.
Just ignore the fact that mine is painted a nifty shade of cyan.