Where's the gas going?

[mtotguy]

When filling my tank the gas gets all the way up to the filler neck and I'll stop. After a few seconds the gas goes down a couple inches and I can add a little more. This can go on and on. I finally just give up and go riding. Where's the gas going? I'm not seeing any on the ground or in the belly pan. My Nytro doesn't do this.

 

[Murse]

On the Apex Gas tank there is a breather hose if i continuously do this gas will eventually leak underneath onto the floor.

 

[gumbellion]

If i do the same it ends up on the driveway.

 

[Murse]

I keep my sled beside my bed at night.

 

[porkchop]

When filling my tank the gas gets all the way up to the filler neck and I'll stop. After a few seconds the gas goes down a couple inches and I can add a little more. This can go on and on. I finally just give up and go riding. Where's the gas going? I'm not seeing any on the ground or in the belly pan. My Nytro doesn't do this.

I too had noticed this when filling up on the trailer, keep topping it off. Got to my destination a couple of times and can smell gas with a 'lil wet puddle underneath it.
Now when it gets to the top 1st time, it's basically full... Less time and $ @ the pump LOL.

Vent hose or such causing the spillage?

 

[yamahas]

The filler neck keeps an air gap at the top for expansion and so it does not just keep spilling out the vent when traveling.

I keep pumping it if I know I will use it right away but if I will be trailering it I wont go past the bottom of the neck.

 

[blueironranger]

Basically besides thicker walls on the 08+ tank, Yamaha installed that white plastic piece to make the EPA happy. Even though the 07' tank is rated for a 1 gallon more it actually only holds about 1/4 gallon more as you could fill that one right to the top JUST like you can the 08+ tank if you pull that white plastic liner out of the tank when you fuel it up.

 

[cannondale27]

My 07 has the white insert.Never saw a Yamaha that didnt unless it was removed.

 

[Mooseman]

Ditto. Both my 07's have them. I did "burp" the MP quite a bit once and could smell gas while riding. Won't do that so much again.

 

[blueironranger]

how long is the white tube on the 07'? Both used ones I looked at before I bought my new 09' didn't have the white sleeve. On my 09' it sticks down a good 2-2.5" below the bottom of the neck and with it pulled out I can get close to 3/4 gallon more gas in it.

 

[Mooseman]

That sounds about right as far as length. I'd be careful overfilling it as per my, and others experiences, losing fuel through the overflow.