I ll do my best, b_a_r. I don t have pictures and my technical writing and
vocabulary is sometimes wanting. I had many of the same experiences you did;
my tank bag is still redolent with gas fumes. The concept I came up with is
simple but ending up with a finished product was more work than I
anticipated. All is built around the standard gas cap and attached tubing
that come with the IMS tank.
First I drilled out the stem/nipple in the center of the cap that the vent
tubing fits around and ended up with a 3/16 ID hole through the center of
said gas cap. I procured a piece of metal tubing 3/16 OD about 3 1/2 in
length. Basically I had the piece bent so that it was an upside down U
shaped that fit into the drilled hole in the center and then fit around so
it touched the outer side of the cap and then turned so the last inch went
horizontally, parallel with the top of the tank. At that end I had a
stepped metal insert about 1 long soldered to the piece of now bent metal
tubing. The insert went from 1/4 where it met the metal tubing to 3/16
where it fit into a 3 piece of the rubber like vent tubing that came with
the tank. I adhered the bent metal piece to the hole in the cap using Marine
Tex, a structural epoxy. and built up this epoxy around it. At the other end
I put a small spring clamp over end of the 3 rubber tube over where it
covered the insert. I also fashioned a small bracket that fit over the metal
tubing where it bent next to the side of the cap and screwed and glued it to
the said cap. The piece of 3 rubber tubing was joined to the long piece of
tubing that it was cut from with a straight 3/16 plastic insert. This was
spring clamped at both sides. This is where I break the vent line to unscrew
the cap when I gas up. The long piece of tubing ended up below, close to the
shock as before.
A word on one way valves: I used to have one in the tank vent line and still
do in my carb vent line. I took the tank one out when a lister posted that
during a hot sunny day his tank literally took on a drastically different
shape. Before that post I thought that the valve would allow air, but not
gas, to go in both directions since I could smell fumes.
Bogdan, who hopes this wasn t too confusing
On 8/21/08 11:12 AM, "boulder_adv_rider"
wrote:
>
>
>
> Bogdan - Can you tells us more on the metal tube vent you installed?
> I've since gone to the Acerbis locking cap but even that leaks when you
> say horizontal for more than a second.
>
> My original cap that came with the IMS tank is now missing some rubber
> on the mushroom seal that helps prevents backflow. But instead of
> replacing the seal from Acerbis ($4...but min order of $10), I bought
> the Acerbis locking cap (also bought a one-way, in-line valve in case I
> didn't like the locking cap).
>
> Normal riding condition, the new locking cap is great...no hose.
> However, in combat I'm not happy with gas leaking from the locking cap
> after tipping over. So when fall-factor increases I might revert to
> the old cap and would install this one-way valve (purchased from
> Fred). However, I've never been comfortable with the fit of the hose
> into the cap especially when it's under my tank bag. So I'm looking
> for ways to improve cap connection incorporating this one-way valve.
> Ultimately, tipping over and leaking gas is dangerous plus bad for the
> environment. Plus it's soaking my tank bag and the associated fumes
> are unacceptable.
>
>
>> > I agree since that s what I did. Tank bag users be informed, however,
> that
>> > the tank vents from the top of the cap, dirt bike fashion. I
> inserted a
>> > metal tube that turns and vents horizontally before joining the rubber
>> > line-not brain surgery.
>> >
>> > Bogdan
>> >
>> >
>> > [Non-text portions of this message have been removed]
>> >
>
>
>
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