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Old 02-17-2009, 12:34 PM
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Default How fast does gas evaporate? Overnight???

I drained my Racor filter bowls yesterday afternoon. All looked good and I didn't notice any water. I use an old glass container so I can examine the fuel I drain. I let the open container on my outside work bench under my house. The container had about 12 ounces of fuel. When I came out this morning I noticed almost half of it had dissapeared (Around 20 hours). Even more was gone this afternoon this afternoon. It seems extremly fast to have it evaporate. Does fuel really evaporate this quickly or is something else going on?
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Old 02-17-2009, 12:40 PM
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Default Re: How fast does gas evaporate? Overnight???

Keep an eye out for dead dogs and/or hobos.
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Old 02-17-2009, 12:45 PM
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Default RE: How fast does gas evaporate? Overnight???

Quote:
jeffro22 - 2/17/2009 12:34 PM

I drained my Racor filter bowls yesterday afternoon. All looked good and I didn't notice any water. I use an old glass container so I can examine the fuel I drain. I let the open container on my outside work bench under my house. The container had about 12 ounces of fuel. When I came out this morning I noticed almost half of it had dissapeared (Around 20 hours). Even more was gone this afternoon this afternoon. It seems extremly fast to have it evaporate. Does fuel really evaporate this quickly or is something else going on?
First off I love Murrells Inlet area and second you should not have an open container of gas sitting under your house (I hate to see you have a fire). If its a hot sunny day maybe that much gas might evaporate.
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Old 02-17-2009, 01:01 PM
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Default Re: How fast does gas evaporate? Overnight???

Yes.....gas will evaporate pretty quick depending on outside temps and humidity.
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Old 02-17-2009, 05:49 PM
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Default RE: How fast does gas evaporate? Overnight???

Without doing the math, knowing the outside temperature and looking up vapor pressures, etc., I'd say "no" this time of the year. 100+ degree weather, maybe. . . but probably not. By the time the gas is half gone it should be a lot darker and smell a lot different as the light components of the gasoline would have evaporated out.
Is that the case?
I suspect someone is messing with you.
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Old 02-17-2009, 08:28 PM
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Default Re: How fast does gas evaporate? Overnight???

Any of your neighbor's kids breathing fire today? Have you checked your driveway for the lurking presence of thirsty gas hogs? It's hard to believe any other animal would try something that aromatic with volatile toxins.
If it was pretty windy and dry last night it might evaporate at a fast rate, certainly faster than H2O. If it is full tomorrow you might want to lock the doors & windows.
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Old 02-17-2009, 08:34 PM
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Default Re: How fast does gas evaporate? Overnight???

Gas evaporates very quickly. faster than most of us would imagine. 6 ounces in a day is certainly possible if not even likely. The problem is, gas in liquid form is not terribly flammable. The fumes, however, are explosive!!!
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Old 02-17-2009, 09:03 PM
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Default Re: How fast does gas evaporate? Overnight???

I once left a few ounces of gas outside in a glass cup that I used to prime the carburetor on my Lincoln. The next day all the liquid was gone and what was left was a strange residue on the cup. It was premium gas.
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Old 02-17-2009, 11:17 PM
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Default Re: How fast does gas evaporate? Overnight???

I think that speed of evaporation is very believable. Of the factors, temp is perhaps the least important, as long as it is not seriously cold, then humidity and wind. Not mentioned is surface area (of the gasoline) which is exposed to the air and wind. Think 6 oz. of gas in a narrow necked Coke bottle, versus the same 6 oz. in a normal, wide topped water glass. If your container had a fairly wide top, I'd think the "disappearance" you are reporting can definitely be evaporation.
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