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Smoke or vapor coming out of gas tank Wed Feb 15, 2017 12:48 am
timz10000
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My 85 K100 would only run when cold, which I just fixed by replacing the rubber on both sides of the throttle bodies (the old ones were disintegrated). (I also replaced all the fuel lines in and out of the tank, and replaced the fuel pump rubber boot that had just started to goo-ify).
Anyway I took it on a first ride and it ran great until the fuel got very low, then the bike backfired and ran rough. I pulled into a gas station and opened the fuel filler cap, and either vapor or smoke wafted out.
Anyone have any idea what that might be about? Could the fuel pump overheat if it's going bad? Or some kind of vapor lock if the tank isn't vented right?
I'm obviously concerned (and not riding it) until I make sure it's not something smoking in there.
Anyway I took it on a first ride and it ran great until the fuel got very low, then the bike backfired and ran rough. I pulled into a gas station and opened the fuel filler cap, and either vapor or smoke wafted out.
Anyone have any idea what that might be about? Could the fuel pump overheat if it's going bad? Or some kind of vapor lock if the tank isn't vented right?
I'm obviously concerned (and not riding it) until I make sure it's not something smoking in there.