1980 suzuki gs1000L gas tank vent tube leaking gas

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daveku
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1980 suzuki gs1000L gas tank vent tube leaking gas

#1 Unread post by daveku » Tue Dec 29, 2015 10:16 am

hello,
I have a 1980 Suzuki gs1000L and on the underside the gas tank on the side is a vent I believe and it's leaking gas when the bike is just sitting there! The bike runs fine and this just started leaking and I don't have any idea why. please help,, thanks
Dave

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JackoftheGreen
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Re: 1980 suzuki gs1000L gas tank vent tube leaking gas

#2 Unread post by JackoftheGreen » Tue Dec 29, 2015 4:12 pm

Dave,

Welcome to TMW! Thanks for giving our community the opportunity to help out. This isn't my area, but someone will be along shortly with exactly the answer you're looking for. In the meantime, post some pics of your bike! (-:

pchast
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Re: 1980 suzuki gs1000L gas tank vent tube leaking gas

#3 Unread post by pchast » Tue Dec 29, 2015 10:07 pm

I think you may mean the drain from the fuel float cover.

My Bike had a bad gasket. That stopped the drip..
2019 Zero DSR, 1980 Suzuki GS550L

GS_in_CO
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Re: 1980 suzuki gs1000L gas tank vent tube leaking gas

#4 Unread post by GS_in_CO » Fri Jan 01, 2016 5:56 pm

Tanks typically have a valve attached to the bottom - which is where the ON/OFF/Reserve lever usually lives.
If the leak is from a rubber hose attached to the valve it's not a vent.

If the rubber hose is attached directly to the tank and not the valve then it probably IS a vent.
If the tank was really, really full and is warmed up from when it was filled the gas expands and will go out the vent.
Chances are that the rubber hose hasn't been replaced since the bike was new so it is cracked and will leak instead of dribbling fuel out below the bike's frame.
Ron

Current: 1988 BMW R100GS (the 'numberplate' model)

Past: 1987 Yamaha XT350
1983 Honda CB900F
1980 Honda XL185S
1979 Suzuki GS425E

daveku
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Re: 1980 suzuki gs1000L gas tank vent tube leaking gas

#5 Unread post by daveku » Sat Jan 02, 2016 10:31 am

hello, and thanks for the reply's.
I replaced all the hoses awhile back so no hoses are leaking and it's not where the ON/OFF/Reserve lever usually lives.
the tank is not full and it's dribbling fuel out below the bike's frame. It leaks quite a bit. I mean like 1/4 cup a day.
I believe it's the gasket from the fuel float cover. I ordered one and I'll post my answer when it comes in. thanks again,
Dave

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Re: 1980 suzuki gs1000L gas tank vent tube leaking gas

#6 Unread post by GS_in_CO » Sat Jan 02, 2016 1:04 pm

daveku wrote:hello, and thanks for the reply's.
I replaced all the hoses awhile back so no hoses are leaking and it's not where the ON/OFF/Reserve lever usually lives.
the tank is not full and it's dribbling fuel out below the bike's frame. It leaks quite a bit. I mean like 1/4 cup a day.
I believe it's the gasket from the fuel float cover. I ordered one and I'll post my answer when it comes in. thanks again,
Dave
"Fuel float cover" is part of the carburetor. So it's not a leaking fuel tank hose.
Problem could be a buggered needle valve and seat for the float as well as possible gasket leak.
You could turn the gas off at the tank when it's parked to stop losing gas for no reason.


EDIT- My 2016 New Year's resolution is to stop answering questions here in Troubleshooting. Posters almost never give the other 80% of the information they have about the problem.
Ron

Current: 1988 BMW R100GS (the 'numberplate' model)

Past: 1987 Yamaha XT350
1983 Honda CB900F
1980 Honda XL185S
1979 Suzuki GS425E

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