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post #1 of 9 (permalink) Old 01-05-2011, 08:01 AM Thread Starter
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Fuel Tank Replacement

Hello, Please help. I have a 1986 vulcan and the gas tank has a hose on the bottom of it. I assume it is a breather hose. I want a new tank and the one for sale has 2 hose hook ups at the base of the tank. (Where the seat mounts). My question is will this tank work on my bike. Mine does not have those hook ups. I assume they are for a emmisions or something. Other than that the tank looks to be the same. Thank you for your help.
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post #2 of 9 (permalink) Old 01-05-2011, 09:15 AM
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Those are vent hoses .. they lead up to the gas cap...jsut keep them from being pinched under the seat and you will be fine... differnt years had differnt styls of venting... mine has none at all but the tanks all fit every year.. your good.
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post #3 of 9 (permalink) Old 01-05-2011, 09:21 AM
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Be sure the tank you're looking at is a VN750 tank. Mine just has one vent on the tank. The gas cap was vented on the first couple of model years and they was no tank vent. Could it be from a California model? Those have extra pollution equipment and might have two vents, but I'm not sure.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
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Currently 23,298 miles

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post #4 of 9 (permalink) Old 01-05-2011, 10:21 AM
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There are 2 hoses on the newer then 86' models. One is the tank/gas cap vent which is the short piece of pipe at the end of the tank and the other connects to the sending unit housing under the tank. Not sure of the purpose of the sending unit hose but maybe in case of internal failure so fuel will drain under the bike instead of on the engine? The tank will work and like clock said make sure they don't get pinched.

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post #5 of 9 (permalink) Old 01-05-2011, 10:52 AM
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The hose at the sending unit is just another place to connect the carb vent hose, the hose that is ussually connected at the right ear.

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post #6 of 9 (permalink) Old 01-05-2011, 11:26 AM
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Mine has that nipple on the plastic cap thingy, but I never thought of it as a vent. Oh well.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #7 of 9 (permalink) Old 01-05-2011, 05:07 PM
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I thought the tanks with two vent nipples at the back were California models.
The left one for the tank vent and the right one for the emissions crap.

But yes, any model year tank should work fine on your `86.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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post #8 of 9 (permalink) Old 01-05-2011, 06:07 PM
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Last edited by FlacoLove; 03-25-2013 at 11:31 PM.
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post #9 of 9 (permalink) Old 01-07-2011, 12:08 PM
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The tanks with 2 vent hoses ARE CA models, but the tank will still work. CA models have elaborate evap cannister systems (which I promptly removed) and both hoses connect to it. Any Vulcan 750 tank will work on any other Vulcan 750, CA model or not. Just connect hoses to the 2 fittings, and run them down below the bike somewhere, and don't connect the other ends to anything. Be aware that one of the hoses is actually an overflow, and if you fill the tank all the way up to the very top, some gas will come out of that hose. I can't remember which hose is which. You can get away with plugging that one, but a lot of people have tank venting problems with the Vulcan, which I believe are mainly caused by that little rubber grommet under the gas cap. Leaving the other hose open gives you an unobstructed vent directly into the tank. You just need to be careful about spilling gas under the bike, in front of the rear tire, then taking off and having the rear tire slide out from under you. I'm always super careful at gas stations anyway, there always seems to be gas and oil on the concrete in front of the pumps.
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