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Old 10-13-2008, 05:34 AM   #1
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Before I park for the winter in the Rio Grande Valley I always top off the fuel tank. But this year we are facing a declining fuel market and I may be able to save significantly by waiting to fill up when I leave the valley in April. Would I be just as safe to keep 1/4 tank and an additive to contain the moisture or should I fill up and forget about it?
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Old 10-13-2008, 05:34 AM   #2
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Before I park for the winter in the Rio Grande Valley I always top off the fuel tank. But this year we are facing a declining fuel market and I may be able to save significantly by waiting to fill up when I leave the valley in April. Would I be just as safe to keep 1/4 tank and an additive to contain the moisture or should I fill up and forget about it?
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Old 10-13-2008, 06:27 AM   #3
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I have always been told not to let a vehicle sit with less than full tanks to minimize condensation inside of the tank.
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Old 10-13-2008, 06:33 AM   #4
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gmfryer

This article is very good! It backs up an earlier thread on algae growth in fuel. It is http://www.proboat-digital.com/proboat/e20081011/, (Professional Boatbuilder magazine), click on Oct/Nov.2008 issue, then at the top click on pages, select article: So You Think You Know Diesel. This may convince you to really top off the fuel tank.
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Old 10-13-2008, 07:12 AM   #5
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I go with Jim and Dave, I always fill up before any length of storage. The possible savings in fuel cost is small in comparison to the problems that could arise from contamination.

Dave,

your link didn't work for me.
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Old 10-13-2008, 07:15 AM   #6
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Ideally, I would like to see our fuel tank filled whenever we return from a trip. It is more important when you live in a damp climate like here in the NW. But given that the local fuel prices running over $.25 higher, I often just wait till we get near lower fuel prices before filling up. Doing this makes it necessary to drain the water out of the water seperator more often.
Engines that run daily, like heavy equipment and OTR truck diesels should have the fuel topped off daily. The engine and injector pump return a lot of heated fuel to the tank. This heated fuel in steel tanks really can creats a moisture problem if the tanks are not topped off daily.
IMHO, a fuel conditioner added on regular basis is a good plan whenever you have to let your MH sit.
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Old 10-13-2008, 08:07 AM   #7
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Leave it 1/4 full and read this article:
myth
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Old 10-13-2008, 11:38 AM   #8
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My relatives for at least 80 years have been operating farm machinery (tractors, combines, harvesters, etc.) and vehicles that have been primarily run on diesel. I have had a diesel MH for 15 years. Neither my relatives nor I have made certain we fill our tanks up when storing our diesels. They have left tractors and trucks out in the open all winter long (in Missouri...and it is humid there) and have never suffered a problem related to fuel. I park my rv beside my house but live in a dryer climate in coastal So. Cal. and have never had a problem or anything that appears like a problem looming. Maybe we have been lucky or just maybe there is not a lot to be concerned about when leaving a tank unfilled.
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Old 10-13-2008, 11:44 AM   #9
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Obviously the person who tried to dispell the myth has never lived in Calgary AB. I have seen it go from 40 below F to 40 above F to 40 below F in the matter of 8 hours.
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Old 10-13-2008, 02:47 PM   #10
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I am one of the believers that does not feel you need to have your fuel tank(s) full. Nonetheless I keep mine that way because it is convenient if we decide to go someplace and not have to think about fuel. I would not leave the tank as low as a quarter tank as you may possibly not be able to start your generator. I would stay with a minimum of a half to 3/4 tank.
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Old 10-13-2008, 07:38 PM   #11
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">I have seen it go from 40 below F to 40 above F to 40 below F in the matter of 8 hours.
</div></BLOCKQUOTE>

Doesn't matter. Modern fuel systems are closed systems.
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Old 10-13-2008, 08:32 PM   #12
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Roadfrog is right. Modern fuel systems are closed - to exhausted fumes. These automotive fuel systems must be open to incoming air, or pull a vacuum in the tank. It is from this incoming air we introduce water (humidity) to our fuel. Since diesel fuel has a natural affinity to attract moisture, I try to minimize the volume of air space in my fuel tanks during storage.
RE: eliminating water already present in fuel. NEVER use any product designed to agglomerate water into your fuel like gasoline engine formulae products. Even very small amounts of water can destroy injectors, and pumps.

I'm not a gambler, full tanks are the safe bet.
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Old 10-14-2008, 04:58 AM   #13
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Whether you fill the tank or not, you may want to add some fuel stabilizer if your rig is going to sit more than two months. Add the stabilizer then add some fuel or drive a while to mix well. Be sure to run the genny to get the stabilized fuel into its fuel system, too.
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Old 10-14-2008, 05:54 PM   #14
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Here in the Florida Panhandle we are proned Hurricanes So I always store short or long term with all appropriate tanks full and ready.
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