I would have that diagram revised.OK yes I hope I know what I'm doing but give me the right way to go.
If I use 2internal fuel pump I will have to switch like this
But If I use only one external fuel pump it will be better.
So I can use only one fuel pump and one fuel line? (I will use yours actualy)
Do you know where I can buy some fuel valve to switch from pump fuel to race gas?