dude it very well could be what lunchbox said, my 240 sat not running for like 2 months when we tried to fire it it woundn't start but had spark and smelled like it had fuel only problem the fuel pump wasn't hooked up, and it wasn't just a little fuel smell it was like a burn my eyes fuel smell, so what im trying to tell you is just cause you smell fuel doesent mean that its there


also are you having any performance issues that are associated with the black streaks/ smoke