Craig, This is how mine works. Petcock is out of the picture. Pump switch is on left side of handlebars. Indicator on switch is "green" when not pumping. Be sure aux tank is full before you need it
(about 5 gallons). With engine running and fuel gauge down to about two bars press down on switch. Indicator goes "red". Occasionally watch fuel gauge to check for full tank. When all fuel
gauge bars are visible, press switch and insure that indicator goes "green". My setup has no automatic shutoff, so full tank can overflow. Important to shut off switch when main tank is full. Letting
pump run on an empty tank may damage the aux pump.
FYI, Carbon_One has a mod that allows pulling fuel from either fuel tank directly. This avoids the overflow problem. Good luck! Leo