Hose question

Joined
Oct 9, 2024
Messages
4
Age
47
Location
Wisconsin
Bike
1991 st1100
Can someone please tell me what this hooks to? Im assuming it's for the fuel system and would it being disconnected cause it to leak fuel? 1991 st1100. Thanks in advance. 1000000571.jpg
 
No idea, but I did some looking....

Looking at parts fiches, it could be part of the charcoal canister. Or the carburetor assembly. Or the fuel tank. Each of those fiche pages had a rubber hose and a 3-way T. I'd doubt the second, since that would affect being able to start the bike (unless it is some kind of vent hose). I'm sure folks who know, like @Uncle Phil, will chime in soon (well, as soon as he returns safely from his RTE and rests up a bit).
 
It appears to possibly be the fuel cap vent hose. The factory put a “T” fitting along the side of the fuel tank, in case the cap vent hose at the bottom of the bike ever becomes plugged. This way the tank would always be vented.

To check, follow the fuel cap vent hose from the cap, to the “T”, then all the way down to the bottom of the bike. The hose comes out just behind the kickstand next to the float bowl drain hose.
 
It was down by the other three hoses by the kickstand like you said but was not connected to anything. I'm assuming the fuel cap vent hose is the red one? That was my first thought but I don't see how you could hook it up because the diameters of the hose and the t are much different. There are no markings on it. I looked at a few parts fiches and couldn't for sure see exactly what it is. Where is the charcoal cannister? I've never heard of that.
 
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