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  1. #1
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    5 Gallon Fuel Jug Caps

    I have bought 5 gallon fuel jugs over the years from Jegs, Summit Racing, etc. The older style (square top) jugs have withstood the test of time/races and the caps spin on and off like they were new. The newer style (tapered tops) on the other hand have spin on caps that have gotten worse over time. I have gone from "spin", to "stiff/one handed", to "two handed stiff" to full-on strap wrenching. Does anybody know how to fix the problem? Galled / worn thread crowns on jugs? Dab of Vaseline on threads? Some sanding?

  2. #2
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    I've been using silicone grease on plastic fittings & threads: https://www.homedepot.com/p/Super-Lu...2003/202932697

  3. #3
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    I Notice the exact same thing. im thinkin the caps are different material and shrink. im at the 2 handed stage now. maybe the neck expands with age. think we just need new jugs..

  4. #4
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    If you had one new jug... if a new cap fits an old jug it's the caps, if an old cap fits a new jug, it's the jugs?

  5. #5
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    Quote Originally Posted by David - WI View Post
    If you had one new jug... if a new cap fits an old jug it's the caps, if an old cap fits a new jug, it's the jugs?
    Trouble is both same age, one round, one square, caps look same. tractor supply has em, 20$. tomorow ill try new cap, switch around see whats what! i could use a 3rd jug anyway mine are white, 5gal.

  6. #6
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    I have a blue one we used for methanol years ago... I should probably try to open it!

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    Same damn thing with my tapered top vp jug, im at the 2 hand stage now. Silicone isn't helping anymore
    1977 Hydrostream Vector 2.5 Promax

  8. #8
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    Quote Originally Posted by David - WI View Post
    I have a blue one we used for methanol years ago... I should probably try to open it!
    GET out the pipe wrench/////

  9. #9
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    I avoid messing with plastic jugs nowadays, by simply buying my race fuel in 5 gallon cans and using this:
    https://vpracingfuels.com/product/po...on-pail/?c=237
    Easiest and quickest way to fill your regular street vehicle or race vehicle/boat fuel cell with race fuel without spilling a drop. Eliminates the need for separate storage containers, funnels, etc. Best damn invention ever.

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    Where can one buy the gasket only for the 5 gallon screw on lids?

  11. #11
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    Gasket Replacement

    Quote Originally Posted by sonicss33 View Post
    Where can one buy the gasket only for the 5 gallon screw on lids?
    Actually, it's an O ring. I found spares on Amazon and eBay.

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  13. #12
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    I have the opposite problem, my caps always seem to split and crack and have to buy new ones every couple of years.

  14. #13
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    Quote Originally Posted by ShadowFlier View Post
    I have the opposite problem, my caps always seem to split and crack and have to buy new ones every couple of years.
    That kind of indicates the caps are drying out/shrinking as the main problem?

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  16. #14
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    Quote Originally Posted by David - WI View Post
    That kind of indicates the caps are drying out/shrinking as the main problem?
    Very possible, but I have always been able to turn them one handed. My barn is also heated so they don't go through as bad of heat cycles like some do.

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  18. #15
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    I went and ordered a kit on amazon, cap, hose with filter, new vent cap. i comment said it will fit a rci jug, some say yes. well, it doesnt fit my jugs [brand unkown] but i fits a tractor supply jug, and vp jug. most likely fit a rural king jug. its a black cap.

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