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Old 08-18-2004, 06:45 AM   #1 (permalink)
Join Date: Jun 2004
Posts: 9
cpadpl is an unknown quantity at this point
Having just got my power (and internet!) back after Hurricane Charley, I'm starting to think about some things I may do right before another hurricane comes through, one of which is store more gas for use in my BMW (I did at least fill up before the storm). I have plenty of stored gas for my generator, but I'm not as concerned about using stored gas on my cheap generator than in my BMW.

Can anyone tell me specifically what I should do to store gas properly for use in my BMW to ensure that I don't damage anything. I know even properly stored gas goes bad, and there is always a problem with exposure to water vapor regardless of the container you use. I know you can add fuel stabilizers, but I'm not sure if this will damage anything in the engine. What kind of container should I use? How long can I keep the gas before it goes bad without stabilizers? I'm also curious as to how long gas stations are able to store their gas in their underground tanks and why? Are they airtight or do they add gas stabilizers?

In short, I'm just not as knowledgeable as I should be on this topic and would like any insight. It's not like having my old F-150 truck where I wouldn't care about driving off a little "bad gas", but this is an expensive BMW that I really don't feel like screwing myself in the rear on by doing something stupid, if you know what I mean.
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Old 08-19-2004, 07:06 AM   #2 (permalink)
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Join Date: Aug 2003
Location: Baltimore MD
Posts: 729
peterkulesza is an unknown quantity at this point
gas does three things in storage.
1. lighter fractions evaporate
2. everything oxidizes.
3. moisture collects in it.

1. cap the container with a gasket tightly.
2. use gas stabilizer (any will do autozone has plenty)
3. add water remover additive, i prefer isopropanol over methanol. better mixing properties, and not as harsh on rubber gaskets.

also, do not store for more than about 6 months.
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