Fuel level?

[GSXFJim]

I commute from LA to the San Fran bay area on the weekends... So I gas up a few times during the round trip....

I was filling up Sunday and noticed that if I filled up near the neck, the level would drop... I fill, it drops... I did this a few times... the next stop I filled it up to the neck, let it sink down and with a slow flow it would fill till I stopped it at the 3.5 gallon mark...
Anyone knowwhat the deal is?.... and its not goin out on the ground....

[Newbie2it]

Your tank might be leaking into your universal blinker fluid reservoir.

Dunno, never saw gas sink, but I have seen it take more than normal. I trickle fill it till it hits the middle of the neck opening. Seems like a lot more gas going in, and in reality, it is, Its the top of the tank, where its the widest.

[The CyberPoet]

The neck on all the Kat gas tanks sticks lower than the top of the tank. In the top of the tank is a curved air-tube that is designed to equalize pressure as the fuel expands/contracts. On the 49-state models, you can fill & burp the tank a bit, but if you fill too much, you'll block that tube and that can result in vapor-lock or fuel pouring out onto the ground.

In the California models, that vapor-tube is actually connected to the charcoal canister system, to absorb the vapors (particularly when parked) and return them via the airbox to be burned next time the engine is running. If you overfill these tanks, the liquid fuel can actually be forced into the vapor-recovery system and you can basically flood out the airbox and make the bike not want to start (because of excessive fuel vapors making the mix too rich due to liquid fuel getting to the airbox, i.e. - literally getting liquid into the charcoal canister). As a result, never burp the California models!

Cheers,
=-= The CyberPoet

[GSXFJim]

mine is a ca unit.. but the PO removed the canister stuff... so Im just not sure where its going.. the air box dosent flood, i never have trouble starting the bike after i refuel.