The Suzuki GSX1400 (2001 model year) fuel pump control system consists of: battery, ignition switch, side-stand relay, engine stop switch, fuel pump relay, ECM and fuel pump. When the ignition switch is turned on, current from the battery flows to the fuel pump motor through the side stand relay and the fuel pump relay causing the motor to turn.
Since the ECM has a timer function, the fuel pump motor stops turning in three seconds after the switch has been turned on. Thereafter, when the crankshaft is turned by the starter motor or the engine has been started, the engine revolving signal input to the ECM. Then, current flows to the fuel pump motor from the battery through the side-stand relay and the fuel pump relay so that the pump continues to function.
A tip over sensor is provided in the fuel pump control circuit. By this provision, anytime the motorcycle tips over, the tip over sensor sends a signal to the ECM to turn off the power to the fuel pump relay, causing the fuel pump motor to stop. At the same time, current to the fuel injectors as well as the ignition coil is interrupted, which then stops the engine.