Any Ideas What This Is?

[bluebird]

The fuel pump switch was probably added so the pump could be cut off, to run the generator out of fuel before storage. That would be a good idea.

[Froggy1936]

I have mine set up with a fuel pump switch, Everytime i ue it when shutting it off (after makeing sure there is nothing being supplied by the generator) I just shut off the fuel and let it run out of gas That emptys the carbuerator preventing any sludge build up no matter how long it sits. Then on restart i just turn on the pump for a few min and it starts right up.  Frank