Sounds like your fuel line disconnected itself inside your fuel tank. This has been a common problem for some Guzzis due to a fuel hose that is incompatible with fuel containing ethanol. You can diagnose this by turning on your ignition and looking inside the tank. If the fuel is swirling around in there, a disconnected fuel line is probably the culprit. You will need an appropriate new fuel line, an all-metal fuel filter, and new clamps to fix it. When it happened to mine, I fixed it in a casino parking lot. However, since the tank must come off you may wish to hitch up your trailer to bring it home.