I'm planning a simple gravity feed solution, with the tank on my rear rack. I plan to remove my top case for the SCR. I've found a 2.25 gallon (there is also a larger 3.5 gal) aux tank with vented cap and outlet for a vent tube as well.
I would like to be able to control the flow of gas from the Aux tank with an inline valve (like a reserve switch) and plumb to a 90 degree elbow fitted to a drilled gas cap on the main tank. Fuel would flow from the Aux tank to the Main tank through the modified cap. An inline quick-disconnect would allow me to disconnect the end with the modified cap to allow for refueling of the Main tank.
The vent tube from the Aux tank would connect to the Evap canister via T-connector in the existing evap line.
My primary concern: is this too simple a design? As the fuel level in the Main tank drops, will this impede the flow of fuel from the Aux tank?
Any suggestions would be appreciated.