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Old 08-06-2012, 08:43 AM   #1
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Cool How Full is Your Fuel Tank When You Store?

I have a question that I have asked others before but no one can give me a real good answer. How full do you have your fuel tank especially Diesel tank when you put it into storage?

The reason I ask is I had always kept mine full until I got a fungus on the fuel even with treatment I have a heck of a time getting it to clear up now.

So I put it to you how full is your diesel tank when your RV goes into storage?
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Old 08-06-2012, 09:17 AM   #2
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Are you asking of long term storage of months? Or between usages of, say, a month or so?

I don't do long term storage. Coach is used at typically monthly for weekend camping, longer trips a couple times a year. Coach is stored at home and kept with 3/4 to full tank in case of emergency (we have had to evacuate due to fires).

This goes for a previous diesel and current gas coach. Never have had a problem with fuel going bad.
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Old 08-06-2012, 09:29 AM   #3
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I usually store it for maybe a month at a time between trips and then 5-6 months in the winter here in WI.

I never had an issue in the past until last year when it seems that I got a fungus on top of my fuel that has been a real bear to resolve. Just when I think its cleared up it comes back after the next storage cycle.

Now I have to treat every time I store even for a few weeks. JR
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Old 08-06-2012, 09:41 AM   #4
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It was suggested that I store ours full to cut down on the chance of condensation. Never considered algae a possibility when storing at <30F I'll treat this winter for sure.
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Old 08-06-2012, 10:24 AM   #5
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Old 08-06-2012, 10:31 AM   #6
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I store mine full as it always seems diesel is cheaper when I get back from a trip as opposed to when I leave. The longest it's stored for is only two months. How did you know there was algae/fungus on the fuel?
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Old 08-06-2012, 11:08 AM   #7
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Look into marine diesel treatments. They are specifically designed to "fungus" which is actually "algae". Since many marine applications use fiberglass as a tank it's common to have algae form.
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Old 08-06-2012, 11:21 AM   #8
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Is there an additive for diesel similar to Staybil that should be used for long term storage? My idea of long term is more than a month or so.

Conversely, It might seem prudent to treat any fuel (gas or diesel if appropriate) if more than half of the fuel is not used in between any 30 day period. Maybe?
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Old 08-06-2012, 11:23 AM   #9
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Whether diesel or gasoline, use an appropiate fuel conditioner or stabilizer and fill the tank. The full tank will minimize the change of moisture condensing.

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Old 08-06-2012, 11:29 AM   #10
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Quote:
Originally Posted by Discovery View Post
I store mine full as it always seems diesel is cheaper when I get back from a trip as opposed to when I leave. The longest it's stored for is only two months. How did you know there was algae/fungus on the fuel?


I was getting a jerking every few minutes until the tank was empty and I put new fuel back in. Even though I treated the fuel I still had issues especially in humid weather storage. It was through this forum that I found out the issue.

Now I am trying to figure out whats better full or tank empty? And then put new in prior to each trip?
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Old 08-06-2012, 11:42 AM   #11
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This may not apply to diesel, but will apply to most gas RV's.

When storing my MH for more then a month I always top off the fuel tank to keep condensation from building up inside the tank. The main reason I do this is to keep the electric in tank fuel pump from corroding.

From reading many threads on fuel pump failure, I have noticed it is generally a concern that shows up after the RV has been stored for some time. If the tank is topped off, the fuel pump will be submerged and protected by the fuel.
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Old 08-06-2012, 12:29 PM   #12
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When storing diesel for a good while you need a biocide. I store a sailboat (in the water) with a diesel from Oct to Apr. Always add a biocide and have had no problems. Any marine store will have it, here is a link from West Marine:

VALVTECT BioGuard Fuel Micro-Biocide at West Marine
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Old 08-06-2012, 03:03 PM   #13
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Quote:
Originally Posted by athuddriver View Post
Is there an additive for diesel similar to Staybil that should be used for long term storage? My idea of long term is more than a month or so.

Conversely, It might seem prudent to treat any fuel (gas or diesel if appropriate) if more than half of the fuel is not used in between any 30 day period. Maybe?

FYI, Stabil has a diesel fuel stabilizer if you didn't now. Pricey but good.
Link. I intend to top off the tank and use it in our cummins this winter during storage. During normal operating months, I occasionally had Seafoam or Lucas fuel treatment or PowerService about 2-3 times and keep the fuel at 3/4-F.
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Old 08-06-2012, 05:13 PM   #14
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I never had an issue in the past until last year when it seems that I got a fungus on top of my fuel that has been a real bear to resolve. Just when I think its cleared up it comes back after the next storage cycle.
Just a thought I had reading this thread. I, and I am sure many others, fill at the same fuel stop near the storage lot before the final short distance to storage so that the fuel tank is full. Is it possible that the fuel station has a problem in their storage tank and you keep reintroducing the problem when you fill?
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