Originally Posted by alan750
If your fuel cap and seat lock share the same key, you can dissassemble the seat latch and see how the gates in the lock are arranged, and grind a spare key to fit the lock. then use it in the fuel cap.
I had to do this on my bike when I got it.
if you have an older bike, the fuel lock is a different key isnt it? if so, then you can pick it. Its not hard, i bet you can get away with a bump pick and a tension pick, and just rake it until it unlocks. If you dont have the tools, i would just drill the thing out.