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Actually, this is quite simple.
You can re-use everything from the pump to the fuel rail unless you're anal about mixing a small amount of different gases together.
The easiest way is to put the fuel pump feed line on selector valve, each branch of the selector valve going to a different tank.
The only complication with this is if you're running a fuel return line from the fuel rail, you should return the fuel to the same tank where the fuel came from, unless you don't care and just return the fuel to a single tank. Or if you can delete the return line somehow.
I run a mechanical fuel pump so I don't need a return line. It would be really simple for me to run a dual-tank setup.
When you want to switch over, evacuate fuel from the rail just like you're doing a fuel filter install. Disable the fuel pump and idle until the engine dies. Then switch the selector valve, turn on the fuel pump, and off you go.
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