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  1. #1
    Platinum Member Carl Bert's Avatar
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    Jul 2010
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    Rockland county, New York
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    Kubota B26, John deere X595

    Default Diesel fuel, how old is too old?

    I sometimes leave my kubota B26 with the same tank of gas for 2 years or so. How long can you keep the same fuel in a tank before it goes bad? I use the best fuel additive on the market, just not sure how long that extends its life. Thanks in advance
    2010 Kubota B26 TLB w/hyd thumb. 2004 John Deere X595 w/62" MMM.

    Carl Bertuzzi

  2. #2
    Elite Member JasG's Avatar
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    Jan 2004
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    3,163
    Location
    CNY
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    Kubota L3240

    Default Re: Diesel fuel, how old is too old?

    I've seen machinery set 3-4 years. I just finished off a storage tank this year that was 6-7 years old.

    All depends on the amount of moisture it is exposed to from what I have read.
    “Government is like a baby. An alimentary canal with a big appetite at one end and no sense of responsibility at the other."


    Ronald Reagan

  3. #3
    Veteran Member
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    Knox, In,
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    Ford 3400, Gizmow ZTR, Simplicity 7116H

    Default Re: Diesel fuel, how old is too old?

    Until algae grows enough to eat it all..

  4. #4
    Veteran Member dragoneggs's Avatar
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    Jun 2013
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    Seabeck, Washington
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    Kubota BX-25D, JD circa 1990 Lawn Tractor

    Default Re: Diesel fuel, how old is too old?

    I was always taught with gasoline engines to run them dry of keep them topped off completely so there is little air to condense and cause moisture. Since you should never run a diesel dry I keep my tank full as much as possible. How does that sound? I never use additives.

  5. #5
    Veteran Member
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    May 2013
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    Knox, In,
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    Ford 3400, Gizmow ZTR, Simplicity 7116H

    Default Re: Diesel fuel, how old is too old?

    Heard that too - Full tank, but add a biocide..

  6. #6
    Member
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    Mar 2013
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    29
    Location
    Menard, TX
    Tractor
    JD 2240; 2011 Bobcat S650

    Default Re: Diesel fuel, how old is too old?

    Newer ultra low sulphur diesel is more prone to algea growth than the older stuff. I typically run through my 250 gallon tanks about every 3-6 months and have not had a problem yet. But a biocide is something to consider.

  7. #7
    Super Member Gary Fowler's Avatar
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    Jun 2008
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    7,143
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    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: Diesel fuel, how old is too old?

    My fuel tank holds about a years worth of fuel now that my major projects are done and I have never had an issue with water, rust or algae. The tank is inside a closed building so no rain can get to it and the tank caps seem to be pretty air tight. I have been working in the shop at nights and scared the beejesus out of me when the tank walls suck in from the slight vacuum, sounds like someone hit the tank with a hammer. I do have a 10 micron filter on it that all the fuel goes thru before it hits any of my equipment. I changed out the filter after about 3 years when the fuel flow got weak but it turned out that it was just the battery going bad and the new filter was the same way so I don't think my filter was plugged up at all after pumping only about 400 gallons.
    If you can believe those reality shows, the Gold Digger in Alaska supposedly got a dozer running after setting 10 years with the same fuel. I don't think he even changed the oil, not that I would try something like that. I do know that the USA has millions of gallons of emergency reserve fuel setting in underground salt dome storage that may be 50 years old. They released some of it for domestic use during the Gulf War because of the oil shortage.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  8. #8
    Veteran Member
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    Knox, In,
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    Ford 3400, Gizmow ZTR, Simplicity 7116H

    Default Re: Diesel fuel, how old is too old?

    I thought the reserved was changed over every so often? And that it was crude, not refined..?

  9. #9
    Silver Member
    Join Date
    Aug 2003
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    222
    Location
    U.P. of Michigan
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    John Deere X728SE

    Default Re: Diesel fuel, how old is too old?

    Some years ago (10+) they were installing new sewer lines in my area. The contractor hit a buried fuel tank along side a party store (in alley). The store used to have fuel pumps back in the 50's-70's as a Greyhound Bus Stop. Anyhow the local contractor pumped out the several 100's gals of fuel and used it in his equipment in exchange for not charging the property owner to remove said tank. I know the owner of the store for the last 30 yrs and he did not know there was a diesel tank buried there as the pumps were gone when he bought the store in early 1980's.
    Mike
    2012 GMC AWD Sierra Denali 6.2L
    2010 J D X728SE w/47" snow blower
    2009 Cadillac CTS4 3.6L
    2006 Honda Rincon 680

  10. #10
    Veteran Member
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    Knox, In,
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    Ford 3400, Gizmow ZTR, Simplicity 7116H

    Default Re: Diesel fuel, how old is too old?

    The Strategic Petroleum Reserve is exclusively a crude petroleum reserve, not a stockpile of refined petroleum fuels, such as gasoline, diesel and kerosene. Although there are small-scale (2,000,000 barrels) heating oil reserves in Connecticut, Rhode Island and New Jersey under the aegis of the Department of Energy (DOE), the federal government maintains no gasoline reserves on anything like the scale of the SPR.
    Strategic Petroleum Reserve (United States) - Wikipedia, the free encyclopedia

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