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Old 06-18-2016, 09:04 AM
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Default Help!!! Gas tank back pressure!???!??

We arrived yesterday in Estes Park at our camp site to the smell of gas and an overflowing, gurgling gas tank. We were pulling a pop-up. And when I opened the cap, it released a bunch of outward pressure. More scary perhaps, there was also a lot of heat coming from the tank as well. Not sure if it was left over from the back pressure, but there was dripping gas at the back bottom of the wheel well, which stopped after about five minutes. no performance issues, no lights. Anybody familiar with this issue?
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Old 06-18-2016, 09:10 AM
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Here's a video....


This was after about 5 minutes. It was actually spitting gas at me when I first opened it.
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Old 06-18-2016, 10:09 AM
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its ethanol at elevation
they all do it
or at least all of mine and the other trucks I have been around in the heat in the mountains
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Old 06-19-2016, 01:10 PM
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Thanks. First time it's ever done it to me after almost two years of ownership and lots of days towing.
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Old 06-19-2016, 03:06 PM
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can't see the video and you don't list what kind of vehcle it is, but i'm guessing it's post 1970. if so, replace or have your charcoal canister vacuumed out. that will help out.
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Old 06-19-2016, 05:56 PM
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The lines between the tank and cannister can get clogged and cause this, too.

Mark
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Old 06-19-2016, 08:24 PM
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I agree with the ethanol theory. I had similar problems with my FJ60 when I lived in the mtns. I could hear the tank boiling often and had it force fuel past the cap a couple of times when at higher elevation and more than half full. (destroying paint!). It always had a blast of pressure when removing the cap. Now that I live in corn country and can buy fuel without ethanol (ironic!) I don't get the pressure blast or boiling tank. I recently did a trip through Colorado and was reminded of it when I couldn't buy fuel without Ethanol!
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Old 06-19-2016, 10:01 PM
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what truck is it? stock?
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Old 06-19-2016, 10:35 PM
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100 series, guys.

And yeah, they all tend to do this.
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Old 06-20-2016, 08:56 AM
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Video link does not work
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