The FiTech ECU for Go EFI systems has a special driver circuit that will drive the fuel pump directly, which means that an external relay is not needed. This driver circuit allows both PWM control (pulse width modulated), and direct internal relay drive of the fuel pump. This allows the voltage to be reduced when the fuel demand is low, such as at idle and light cruise.
Pump Prime time = At Key On, the pump is turned on for this much time, which allows the throttle body to be purged of air pockets, and for the pressure to be built up to the normal operating pressure.
TPS for PUMP ON = If the throttle is opened above this position, the internal relay is turned on to supply full power to the fuel pump.
RPM for PUMP ON = If the RPM is above this speed, the internal relay is turned on to supply full power to the fuel pump.
PWM Low Flow = When the fuel flowrate is low, and all of the other conditions for allowing PWM control to be met, this is the percentage of duty cycle that is used. Set this such that fuel pressure doesn’t drop below the rated fuel pressure of the system.