Fuel tank overflow/breather hose

MFP

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Joined
May 9, 2018
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1,410
Location
NYC, NY
I have owned my '13 S10 for over two years now. This has never happened before as far as I know:
Today after a 30 mile scoot home from a friend's place I stopped to top off my fuel tank (bike was on the center stand) which was about half full.
The temp at the time was in the low 80s.
After filling up I noticed about a 3" wet spot with gas dripping from the fuel tank breather hose which is side by side to the fuel tank overflow hose which both exit next to the lower left side of the engine through the ACD skid plate I have installed. As far as I recall I did not fill past the fill line plate inside the fuel tank but I assume that when pulling out the fuel pump nozzle I may have allowed some fuel to spill into the side of the fuel tank opening where there are a few vent holes. I went for an additional 20 mile ride to use up some fuel. When I got home and parked in the my driveway (almost level ground) I put the bike up on the center stand and went to put together a BBQ for me and my wife. About and hour or so later when I came back there was a less than a dime sized drip spot (gas again). I moved my bike up a couple feet to the side (a dry spot on the ground) also on level ground put it on the center stand and left it. About an hour later I see no more drip spot so I moved my S10 into the garage, put it on the side stand and went back inside.
About 40 minutes later I just wanted to double check to see if there is anymore dripping and there it was another gas drip spot less than the size of the top of a pencil eraser.
Why almost seven hours later after a fill up would this still be happening?
I understand the function of both the fuel tank overflow and and fuel tank breather hoses but should I be
concerned?
 
Last edited:
B

ballisticexchris

Guest
I think it's just the fuel expanding and exiting through the breather. This has happened to me a few times as well after a fill up. And with the heat we are having.....
 
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Squibb

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Joined
Aug 10, 2014
Messages
1,064
Location
Bedford, UK
Could there be a kink or partial blockage in the breather/drain lines, allowing a minor spill or expansion to cause fuel to back up.

I would blow both lines through with compressed air, maybe lift the tank to check the run of the lines & make sure the cap seal is good. It doesn't sound like anything sinister, but worth monitoring.
 
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