I have an IO360 ECI Titan engine on my airplane equipped with the auxillary fuel pump purchased from Vans. In every other airplane I have owned, the engine would run and idle properly with the electric fuel pump on. The RV8 will run, but it certaonly runs very rich and rough with the pump on. It will continue to run at idle with the mixture at idle cut off. I'd like to be able to run the pump on takeoffs and landings like in other airplane. Is this normal? Do I need to install a different pump?