Parked my 1982 GS1100 in the garage last fall, got it out this spring & the fuel tank was empty & the fuel had mixed in with the oil (& leaked onto ground).

I drained the oil (which was mostly gas), re-filled the oil & fuel, ran the bike for 20-30 seconds & my oil was about 1/2 fuel 1/2 oil.

The carbs are NOT leaking when the engine is off. The bike ran fine (or at least I thought) when I parked it last fall. Something is causing a LOT of fuel to be dumped in with the oil while the engine is running.

Any ideas?