Dual Tank Switching Valve, is it working?

[Nickelcharlie]

First, thanks to 100%Chevy, jwilson645,blazer2007, and Dead Parrot for the great information in my previous treat on, No gas to the Carburetor. I have the bed off and I am fixing to check the condition of inside my tanks, replace rubber lines, and clean ground wires.

Second question, how do I know if my switching valve is working. I can hear it making noise when I toggle the switch on the dash. Is that enough evidence that it is working? Thanks