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Ted in NE-OH 
Orange Level
Joined: 12 Nov 2009
Location: Austinburg OH
Points: 1703
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 Topic: Gas leaks AC-B,C,CA etc.
Posted: 05 Dec 2016 at 9:21pm |
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I have fought gas leaks from the sediment bowel of an AC B and pulled my hair out trying to fix it even with the pet cock fully off. Drips from the bottom of the bowel. I finally figured it out. The packing around the pet cock shaft is always under pressure from the gravity of the fuel in the tank, even with the petcock turned tightly off. Tightening the pet cock packing nut solves this problem. wa-la
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CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914
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Ted J
Orange Level
Joined: 05 Jul 2010
Location: La Crosse, WI
Points: 18786
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Posted: 06 Dec 2016 at 7:36pm |
If I remember correctly (lucky I can remember at all  ) there was a thread on this a few years back and this was one of the most overlooked reasons for the leaking. Most people think it is the bowl gasket or the needle seat, but it is the packing behind the nut. That packing is hard to find anymore. There aren't enough old GOOD hardware stores anymore. Most plumbing material will be eaten up by the gasoline. Glad you figured it out Ted......
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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 06 Dec 2016 at 8:08pm |
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I think teflon based packing will stand up to gasoline and most everything else.
Gerald J.
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Chalmersbob
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Joined: 11 Sep 2009
Location: Pennsylvania
Points: 2122
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Posted: 06 Dec 2016 at 9:14pm |
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I looked for a Teflon rope to use as packing on the nut but finally just too Teflon plumbing tape and twisted it and wrapped it around the shaft several times. It works fine. Bob
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4 B's, 1 C's,3 CA's, 2 G's WD, D14, D15, B-1, B10, B12, 712S,
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 22269
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Posted: 07 Dec 2016 at 6:10am |
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I'm thinking a shot of sillycon that fills the area around the stem and 'void', once fully cured, should work.
Gas don't hurt it
It'll be a little 'grippy' for a few uses but should 'self seal'.
I know it's a 'trick' the 9N guys have done to stop rear axles from leaking oil !
Jay
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22818
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Posted: 07 Dec 2016 at 6:22am |
After I drain the 45 and added fresh non alcohol gas with stabil, I find out the packing is gone! 
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Ted J
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Joined: 05 Jul 2010
Location: La Crosse, WI
Points: 18786
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Posted: 07 Dec 2016 at 7:22am |
 CTuckerNWIL wrote:
After I drain the 45 and added fresh non alcohol gas with stabil, I find out the packing is gone!
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OUCH!!
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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
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Gary Burnett
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Joined: 11 Sep 2009
Location: Virginia
Points: 2928
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Posted: 07 Dec 2016 at 7:25am |
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If you don't care about it being original the best route I've found is to do away with the sediment bowl assembly and put in an inline filter and inline cutoff.
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Alberta Phil
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Joined: 13 Sep 2009
Location: Alberta, Canada
Points: 3727
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Posted: 07 Dec 2016 at 10:20am |
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I've been using the teflon tape twisted into a string for years now and it always seals just fine. If the leak won't stop, check the outer packing nut for a hairline crack. I've seen several like that and if it's cracked it'll never seal.
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