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Post by lain on Dec 27, 2014 17:27:42 GMT -5
So I finally got myself on the road again. However when I filled up the tank it started leaking gas out of the hose that comes out of the top of the tank. The guy did fill it higher than I told him, I told him to fill it 3/4 of the way, he filled it until it was at the cap. >.>
What is this hose for? Why would there be a hose on the top of the tank since the gas comes out of the bottom? Is it to let air in maybe? If so why was is leaking gas right after a fill up?
I ended up pushing it home, by the time I got home the gas leak had stopped but it still worries me a lot to have volatile fluids leaking from my scoot.
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Post by JoeyBee on Dec 27, 2014 17:42:41 GMT -5
So I finally got myself on the road again. However when I filled up the tank it started leaking gas out of the hose that comes out of the top of the tank. What is this hose for? Why would there be a hose on the top of the tank since the gas comes out of the bottom? Is it to let air in maybe? If so why was is leaking gas right after a fill up? I ended up pushing it home, by the time I got home the gas leak had stopped but it still worries me a lot to have volatile fluids leaking from my scoot. The top hose from the tank is there to vent pressure and allow air to displace the emptying gas. If a substantial amount come out from the top hose after fueling, it sounds like you over filled your tank. To solve the problem try not to over fuel the tank. As for the hose, some models have it connecting to a canister that possible cleans the vapors. I just have the hose venting to the atmosphere with a fuel filter on the end to prevent dust from entering the tank. It sits lower than the picture attached below. I moved it for better visibility. i.imgur.com/yqrV5JB.jpg |
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Post by lain on Dec 27, 2014 17:49:59 GMT -5
Cool, thanks. I tied mine up after finding the gas leaking from it but I think I'll untie it and add a filter to it now instead like you have.
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Post by JoeyBee on Dec 27, 2014 17:58:15 GMT -5
No problem man. It's good to hear you got your scoot up and running. I'm new here and to scooters, so for the past month I've been every topic I can.
As for the fuel tank, you need that hose venting. Similar to drinking from a glass or plastic bottle if you don't allow air into the container while "chugging" or constantly drinking it gets harder and harder for the liquid to escape due to negative pressure, a vacuum. The top vent equalizes the pressure by drawing air back into the tank. It's all sorts of cool science and physics.
Call me a nerd but I like that kind of stuff.
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Post by JerryScript on Dec 27, 2014 18:50:52 GMT -5
What several members have done is drill a 1/16 inch hole in the gas cap, then plug the gas tank vent tube if it had one. Most of those who did this did not have a vent tube, and needed the extra ventilation to prevent vacuum lock.
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Post by JoeyBee on Dec 27, 2014 19:02:55 GMT -5
What several members have done is drill a 1/16 inch hole in the gas cap, then plug the gas tank vent tube if it had one. Most of those who did this did not have a vent tube, and needed the extra ventilation to prevent vacuum lock. That's another good idea for allowing venting. Is there any benefits between the various methods? Or just personal preferences? |
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Post by tvnacman on Dec 27, 2014 19:38:37 GMT -5
What several members have done is drill a 1/16 inch hole in the gas cap, then plug the gas tank vent tube if it had one. Most of those who did this did not have a vent tube, and needed the extra ventilation to prevent vacuum lock. 2nd this |
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Post by JerryScript on Dec 27, 2014 20:23:18 GMT -5
What several members have done is drill a 1/16 inch hole in the gas cap, then plug the gas tank vent tube if it had one. Most of those who did this did not have a vent tube, and needed the extra ventilation to prevent vacuum lock. That's another good idea for allowing venting. Is there any benefits between the various methods? Or just personal preferences? I think the only benefit to drilling a hole over using a vent tube is that there is no chance of a siphon effect with a vent hole in the gas cap. With a vent tube, if the tank is over filled and sloshed, and perhaps the scoot has to be at the proper angle, you can get siphoning as soon as the vent tube is full for a moment. This shouldn't occur with a properly placed vent tube, but scooters are not always on flat ground, and stuff happens!  |
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Post by lain on Dec 27, 2014 20:35:07 GMT -5
I untied the vent tube, let it be without a filter for the ride, seemed it did not leak at any time during the ride or during warmup. Guess it was just overfilled.
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Post by JoeyBee on Dec 27, 2014 21:19:25 GMT -5
I think the only benefit to drilling a hole over using a vent tube is that there is no chance of a siphon effect with a vent hole in the gas cap. With a vent tube, if the tank is over filled and sloshed, and perhaps the scoot has to be at the proper angle, you can get siphoning as soon as the vent tube is full for a moment. This shouldn't occur with a properly placed vent tube, but scooters are not always on flat ground, and stuff happens! Thanks for the explanation. I was wondering because the drill hole has a much smaller diameter than the venting hose. After reading your initial post more careful, I understand how drill can help improve ventalation. Either way, I'm here to learn. |
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