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Gas leak

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crank start
10+ Years
10+ Years
Posts: 19
Joined: Sat Jan 22, 2011 12:24 pm
Zip Code: 23072
Tractors Owned: 1951 Farmall Cub
Location: Hayes, VA

Gas leak

Postby crank start » Fri May 15, 2015 8:26 pm

Gas is leaking around the threads where the filter bowl screws into the gas tank on my '51 cub. What type of compound would you recommend I use to screw it back in with?

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staninlowerAL
10+ Years
10+ Years
Posts: 4974
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1 is for parts), (1)'57 IH Cub LoBoy w/FH, (2)154 Number Series Loboys, (1 is for parts), '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '47 & '49 Avery V, '53 MM BG (offset), '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76? Yanmar 2TR15 1500 & Bush Hog SQ42S-2 mower, '78? FORD Dexta, '86 FORD LGT14D & 48" Mower, (2)Cub Cadets & Mowers (MTD), (4) Sears Surburban's, other MTD mowers, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: Gas leak

Postby staninlowerAL » Fri May 15, 2015 8:30 pm

Teflon tape, yellow is my preference. A lot easier to do with the tank removed from the tractor. The fitting is 3/8 inch pipe thread (tapered).
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)

User avatar
pharmerphil3
10+ Years
10+ Years
Posts: 954
Joined: Sat Apr 22, 2006 11:10 am
Zip Code: 06468
Tractors Owned: 1948 Cub
1955 Cub
1961 Cub
1963 Cub
1964 Cub Cadet 70
1969 Cub Cadet 125
100 Spreader
144 Cultivator
3 Field Cultivator
22 Sickle Mower
193 Plow
54-Plow
59 Wood's Mower
2030 John Deere
Circle of Safety: Y
Location: CT, Monroe

Re: Gas leak

Postby pharmerphil3 » Sat May 16, 2015 5:11 am

:Dito: Teflon tape, it worked for me.

crank start
10+ Years
10+ Years
Posts: 19
Joined: Sat Jan 22, 2011 12:24 pm
Zip Code: 23072
Tractors Owned: 1951 Farmall Cub
Location: Hayes, VA

Re: Gas leak

Postby crank start » Sat May 16, 2015 12:08 pm

Thanks, I've got the tank out and will try the tape this afternoon, never seen yellow.

Bob McCarty
Team Cub
Team Cub
Posts: 11817
Joined: Tue May 25, 2004 8:02 pm
Zip Code: 80501
Tractors Owned: Cubs, MH Pony, Shaw, Allis G, 1934 Silver King, JD LA and LI, Gibson D, David Bradley Tri-Trac
Circle of Safety: Y
Location: CO, Longmont

Re: Gas leak

Postby Bob McCarty » Sat May 16, 2015 4:03 pm

Yellow is just thicker than white. Other than that, no difference.

Bob
"We don't need to think more,
we need to think differently."
-Albert Einstein

staninlowerAL
10+ Years
10+ Years
Posts: 4974
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1 is for parts), (1)'57 IH Cub LoBoy w/FH, (2)154 Number Series Loboys, (1 is for parts), '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '47 & '49 Avery V, '53 MM BG (offset), '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76? Yanmar 2TR15 1500 & Bush Hog SQ42S-2 mower, '78? FORD Dexta, '86 FORD LGT14D & 48" Mower, (2)Cub Cadets & Mowers (MTD), (4) Sears Surburban's, other MTD mowers, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: Gas leak

Postby staninlowerAL » Sat May 16, 2015 4:41 pm

Bob McCarty wrote:Yellow is just thicker than white. Other than that, no difference.

Bob

The yellow has "rated for gas application" on the label. It's colored yellow so the inspectors can see that the spec type was used when called out on a job like threaded pipe on a gas line. A full line hardware store will probably have it.
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)

Bob McCarty
Team Cub
Team Cub
Posts: 11817
Joined: Tue May 25, 2004 8:02 pm
Zip Code: 80501
Tractors Owned: Cubs, MH Pony, Shaw, Allis G, 1934 Silver King, JD LA and LI, Gibson D, David Bradley Tri-Trac
Circle of Safety: Y
Location: CO, Longmont

Re: Gas leak

Postby Bob McCarty » Sat May 16, 2015 5:19 pm

Stan, I don't mean to start an argument with you, but all the colors are the same material. Commonly called Teflon as developed by DuPont. They no longer make it and want it referred to as PTFE tape (polytetrafluoroethylene). I had 6" strips of both white and yellow immersed in a sealed jar of gasoline for over 6 months with no observable change. The "gas" on the label actually refers to natural gas, not gasoline.
From an internet article:

"Thread seal tape used in plumbing applications is most commonly white, but it is also available in various colors. White PTFE is single density, yellow is double and pink is triple . It is often used to correspond to color coded pipelines (US, Canada, Australia and New Zealand: yellow for natural gas, green for oxygen, etc.). These color-codes for thread sealing tape were introduced by Bill Bentley of Unasco Pty Ltd in the 1970s. In the UK, tape is used from coloured reels, e.g. yellow reels for gas, green for potable water.

White – used on NPT threads up to 3/8 inch
Yellow – used on NPT threads 1/2 inch to 2 inch, often labeled "gas tape"
Pink – used on NPT threads 1/2 inch to 2 inch
Green – oil-free PTFE used on oxygen lines and some specific medical gasses
Gray – contains nickel, anti-seizing, anti-gailling and anti-corrosion, used for stainless pipes
Copper – contains copper granules and is certified as a thread lubricant but not a sealer
In Europe the BSI standard BS-7786:2006 specifies various grades and quality standards of PTFE thread sealing tape."

Bob
"We don't need to think more,
we need to think differently."
-Albert Einstein

staninlowerAL
10+ Years
10+ Years
Posts: 4974
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1 is for parts), (1)'57 IH Cub LoBoy w/FH, (2)154 Number Series Loboys, (1 is for parts), '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '47 & '49 Avery V, '53 MM BG (offset), '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76? Yanmar 2TR15 1500 & Bush Hog SQ42S-2 mower, '78? FORD Dexta, '86 FORD LGT14D & 48" Mower, (2)Cub Cadets & Mowers (MTD), (4) Sears Surburban's, other MTD mowers, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: Gas leak

Postby staninlowerAL » Sat May 16, 2015 5:27 pm

No problem Bob. I agree completly with your post. I just didn't articulate it near as well as you did. As stated, I just prefer the yellow, the thicknes seems easier to work with for me.
yellow teflontape.jpg
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)

User avatar
Stanton
Cub Pro
Cub Pro
Posts: 7760
Joined: Mon Jun 22, 2009 6:56 am
Zip Code: 64070
Tractors Owned: 1942 Farmall AV, serial #87025
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
Circle of Safety: Y
Location: Lone Jack, MO

Re: Gas leak

Postby Stanton » Mon May 18, 2015 6:35 am

If you don't want to go the tape route, use Permatex No. 2 sealant. It is oil and gasoline resistant. Used it with complete success for many, many years now.
Stanton
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leerenovations
10+ Years
10+ Years
Posts: 382
Joined: Sat Sep 03, 2011 4:12 am
Zip Code: 74857
Tractors Owned: 1948 McCormick Farmall Cub (Farmalice), 1949 Ford 8N (Red), Unidentified horse drawn road grader with 8 ft moldboard.
Circle of Safety: Y
Location: Newalla, Oklahoma

Re: Gas leak

Postby leerenovations » Mon May 18, 2015 9:58 pm

Use the redneck fix and use duct tape. Just make sure to use enough baling wire to properly hold the thingamajigger to the doohickey. I jest of course, please don't use that advice.
Tractors are like watermelons: the RED is good and you throw away the GREEN.


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