After sitting for six months I stated up my 1999 BMW1100rtp.
Immediately gas started pouring out from the right side in back of the right head cylinder.
I shut the engine off and since that date had started the bike maybe 10 times. NO LEAK>
I took all the Tupperware off, inspected everything , tightened the gas line clamps,and put everything back..
Have ridden the bike some 200 miles since then.No leaks.
Could the gas in the tank expanded over the winter ( I live in Florida) and came out the overflow upon startup?
Could the canister became clogged.
Should I carry a fire extinguisher when I ride?
Morning Retired At LAst
Not that unusual on the BMW 1100/1150 bikes if they have quick disconnects in the fuel tank hoses.
The "O" rings inside the quick disconnects get a bit old & hard so when the bike sits for a while the slight negative pressure in the fuel system due to fuel cooling (temperature changes) tends to unseat the "O" rings.
When you first start it after sitting the "O" rings fail to seat again so you get a fuel leak.
Sometimes after a few key-on pump cycles, or engine warming, they will seat again & the leak goes away (for a while) or until the bike sits again.
Not 100% positive it's the cause but a darn good good guess is that new "O" rings inside the quick disconnects (or quick disconnect replacement) will stop your after storage fuel leak.