Tank Vent Question
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Stellar HDF Member
Joined: Jul 2006
Posts: 3,029
Likes: 449
From: Michigan
Tank Vent Question
I bought an aftermarket tank for my 87 project and it has a vent tube that has a nipple on the bottom of the tank and the tube runs thru the tank and has a small hole next to the fuel fill hole at the 6 o'clock postion in the rim. I am assuming this is for the emissions that some bikes came with right?? Can I just trim it flush with the bottom of the tank and seal it? Nothing on my old tank attached to a vent like this. Please advise.
Road Warrior
Joined: Dec 2007
Posts: 1,286
Likes: 64
From: SoCal
Myself, I'd use it as a vent/overflow and just run a line off the nipple down to the bottom of the frame.
A couple of times, I have filled my tank just before going home and after parking, the heat off the engine caused the fuel to swell enough to overflow onto the ground through a similar tube I have on my tank. I think that is better than overflowing on my paint. My tube has a nipple up by the dashboard...I wish mine had a nipple on the bottom like yours does.
Your gas cap will probably be vented so you don't really need that thing as a vent but I was glad I used mine as an overflow.
A couple of times, I have filled my tank just before going home and after parking, the heat off the engine caused the fuel to swell enough to overflow onto the ground through a similar tube I have on my tank. I think that is better than overflowing on my paint. My tube has a nipple up by the dashboard...I wish mine had a nipple on the bottom like yours does.
Your gas cap will probably be vented so you don't really need that thing as a vent but I was glad I used mine as an overflow.
Road Warrior
Joined: Dec 2007
Posts: 1,286
Likes: 64
From: SoCal
Oh, I think I understand now. So it isn't just below the cap down in the neck that goes into the tank?
I wonder what that would be for...must be a vapor thing like you said.
Can you put up a picture of this thing?
I wonder what that would be for...must be a vapor thing like you said.
Can you put up a picture of this thing?
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
It is a secondary vent and overflow tube. It can save your paint job as atated before. It is an option. If you seal it make sure your eseal it good because if it leaks it will strip the paint off of the surronding area. Personally we use them when we get a tank equiped with them. Hope this helps.
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