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Old 05-27-2014, 07:17 PM   #1
Arclite OP
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Joined: May 2007
Location: Oceanside
Oddometer: 34
Gas Cap Pops Open!

I'm in Twentynine Palms right now and it was about 100 deg's F today.

My bike was in the sun for the majority of the day and when I rode off I smelled gas. Upon parking, I noticed the gas cap wasn't fully shut and I'm almost certain I closed last fill up, otherwise I would've smelled gas prior to parking and leaving the bike and it sitting in the sun.

When I looked in the gas cap filler area, I noticed a tiny tab of white-metal sitting on the red plastic area too. It looks like it came off the bottom of the hinge...and unfortunately, looks like the other side broke off too (and is now likely in the tank).

To make matters worse, fuel is seeping out from underneath the plastic collar to the point where it looks visibly wet on underneath the body panel and on the tank.

So, question is, have any of you ever had the gas cap pop open due to heat and expansion?
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Old 05-27-2014, 07:40 PM   #2
Reaver
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Location: Tronna area, Ontario Canada
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I haven't heard of this but it seems your vent lines are pinched or otherwise non-functional. I'm assuming "oceanside" is in the US which means you have a Charcoal Canister. I'm not familiar with those.

It is theorized that the pressure buildup will cause the infamous tank cracking.

Fix it!

Oh, and stop overfilling it.
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Old 05-27-2014, 08:02 PM   #3
Stephenmarklay
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I kind of wonder if you have just filled it too much. I think the bottom of the neck is MAX for expansion purposes.
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Old 05-27-2014, 09:40 PM   #4
Arclite OP
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Location: Oceanside
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We'll see.

I did fill it today; however i didn't fill it past the bottom of the whole of the red plastic filler.

Who knows, maybe I was just a bone head and didn't fully close it.

I noticed the fuel smell cause I was gassing it lifting the front and sloshing the fuel around.

Thanks
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Old 05-30-2014, 09:40 AM   #5
Bumbobee
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Mine has never popped up but it is hard to close sometimes. I learned to really punch it shut with my hand and then it stays.
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Old 05-30-2014, 10:46 AM   #6
Camel ADV
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Location: Calgary, Alberta, Canada
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I bet your silver one-way valve is totally plugged. There's a porous check ball in valve that moves easily to allow air into the tank but is restricted when air is moving the other way. The pores in the check ball are supposed to bleed off positive pressure but they can become clogged and seal the system not allowing any positive pressure to release.
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