Bonneville America Forums Forums Technical Forums General Tech Fuel Tap

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(Answering a couple of posts at once)

There is a good reason to shut off the fuel valve when you park. When the weather is warm, the gas in the carburetors will expand from the heat, possibly enough to overflow. Some of this overflow often spurts up into the carb body where it evaporates and cools the carb. This, in turn, cools the gas in the floatbowl, so it contracts and the bowl refills. Then the cycle starts again. Another potential for disaster is that, sitting overnight, the gas in the bowl will contract, dropping the float down to refill the bowl. With the bike leaning over on the sidestand and no engine vibration, it is possible for the float to stick and pour gas out all over the place.



>QUESTION: How full(up into the neck chamber) should the tank be filled?? <

Once you start filling the neck, you aren’t getting much more than just the gas going into the neck. The dept of the neck is designed to keep an air space at the top of the tank to allow for fuel expansion.
By the way, heat expansion works in the storage tanks too. To make sure you get the most for your money, fill up before mid-morning. Cold gas is more dense than warm gas, so a cold gallon is more gas than a hot gallon.

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