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venting problem

rhino

Banned
was riding with a buddy the other day and stopped for a beer and noticed gas running out the rubber overflow hose. then popped the fuel cap and the tank was pressured. sounds like a venting problem to me but im not familiar with his bike and how its vented and if the cap is vented. he has a 06 sporster custom, carbureted. any advice will be appreciated.
 
glider my softtail does the same thing if i fill it up while leaned on kick stand .if i fiil it up standing upright it does not do it ??
 
If it's leaking out the overflow tube, check the gas cap gasket too. If there's pressure , it's usually the vent.
 
thanks glider, swapped caps and no problems so far. cant get many miles on today were dodging downpours. new fuelcap was on his list anyway, now he just has to pick one. thanks again.
 
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