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Friend and I were out riding yesterday. Both riding Fatboys, me on my 2003 and him on his 2001.
We stop to get gas, both fill up. He starts his bike and it pukes gas out under the bike. About 1/2 pint I woud guess. I asked him about it and he said his does it every time he fills up. To my knowledge, my bike has never done this. Is this something he needs to get fixed? Didn't seem right to me. He says it is because he over filled. I fill mine as far as I can when I fill up.
Thoughts?
I fill mine to the rim and have never had this happen. My bike will leave a small oil spot under the vent hose (in front of the mudguard on the rear tire) if my oil tank is overfilled, but never gas.
Was the bike originally purchased in California? I bought mine in LA when I lived out there. The CA bikes have a charcoal canister instead of letting the bike vent into the air. MIne kept clogging on a trip andI had the line unhooked from the canisterto let it vent freely. With that being said when I fuel up and its fairly warm out I tend to leave a puddle as you decribe.
My guess is that it was a warm day, borbably mid morning, and you had just stopped long enough to fill up or, filled first and then took care of other business. Morning gas is cool and more dense because the days heat hasn't yet soaked into the ground and warmed the storage tank. This is good because you get more gas for your money than when you fill up in the late afternoon or evening when the gas is warm and has expanded.
OK, so you fill the bike with cool gas, maybe wiggle it around to expell some air and squeeze a little more gas into the tank. Then you go inside to collect your change or maybe just sit there waiting for the receipt from a 'pay at the pump' and the heat from the engine warms up the gas. Gas expands and pukes out the vent hose. This will stop happening if you stop pumping as soon as the gas touches the ring at the bottom of the filler neck or a little before that.
You are overilling the fuel tank. Too much fuel comes out and cloggs the charcol canister usually located on the neck of the frame. All HD bikes in the past few years have had this, not just CA bikes.
I would bypass the canister and run it to the ground. As well, stop when you reach the ring. I also want to add.......put the bike on the stand and pump fuel as well. Having the bike upright, overfilling becomes common.
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