Petcock/sediment bowl conundrum

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
w30bob
Cub Star!!
Cub Star!!
Posts: 323
Joined: Fri Dec 08, 2017 4:58 pm
Zip Code: 20634
Tractors Owned: 1959 Farmall Cub
1939 Farmall A
1975 John Deere 301
2015 Kubota BX25DLR
1952 Dodge M37 Weapons Carrier
1955 Willys M38A1
Location: Great Mills, MD

Petcock/sediment bowl conundrum

Postby w30bob » Thu Dec 06, 2018 4:46 pm

Hi Guys,

Ever have one of those days when you're pretty sure you ARE going nuts? So I noticed the little "L" shaped handle on the fuel petcock was leaking. Nothing to that..........just pull it off and replace it with another one from my parts pile. 5 minutes tops. Well........when I pulled it off I saw the threads were all messed up on the pot metal petcock, so of course it leaked. Now I got to pull off the whole petcock/sediment bowl and replace that. Again, no biggie, I'm sure I've got one or five in the parts pile. 10 minutes tops. So I go grab one, take it all apart, blow air thru all the openings, check all the threads and put it back together. Install it on the tractor, connect the fuel line, put some gas in the tank and open the spigot "L" handle. Drip....drip.....nothing. Hmmmmm.......that's not right. Look in the tank to make sure I'm covering the hole with fuel......yup. Ok, maybe I didn't blow it out completely and there's still some crap in one of the internal passages. Off it all comes, back on the bench, take it apart, blow it out. Find nothing. Start overthinking it, as usual. I know there's no vent hole anywhere.....and I didn't get within 5 feet of the carb at any point except to disconnect the fuel line........and it ran great before all this. So back on the assembly goes and in goes the fuel.....and I turn the spigot again. Drip...drip....nothing. Lots of cussing at this point, but luckily the dog passed on last week so there was no kicking the pooch. I loosened up the little glass cup and fuel ran everywhere. Close the spigot, empty the bowl and reinstall. Open the spigot.......drip....drip....nothing.

I seem to have a vague memory of this happening once before, but I could just be hallucinating. I've got a feeling some of you folks have been down this path......so when you get done laughing at me..........please tell me what I'm missing here.

thanks,
bob

tst
5+ Years
5+ Years
Posts: 2983
Joined: Tue Jan 12, 2010 2:08 pm
Zip Code: 12514
Circle of Safety: Y

Re: Petcock/sediment bowl conundrum

Postby tst » Thu Dec 06, 2018 5:07 pm

the fuel is air locked when empty, just loosen the bale on the bowl to vent it, that is normal

w30bob
Cub Star!!
Cub Star!!
Posts: 323
Joined: Fri Dec 08, 2017 4:58 pm
Zip Code: 20634
Tractors Owned: 1959 Farmall Cub
1939 Farmall A
1975 John Deere 301
2015 Kubota BX25DLR
1952 Dodge M37 Weapons Carrier
1955 Willys M38A1
Location: Great Mills, MD

Re: Petcock/sediment bowl conundrum

Postby w30bob » Thu Dec 06, 2018 6:22 pm

Oh come on TST.....that's way too easy. I'm pretty sure I'll need to take it apart at least 4 or 5 more times and kill at least half a day.......

Interesting note........I bought 4 or 5 new rubber gaskets for the sediment bowl from someone on eBay a few months back....I'll find out exactly who later......and had installed one on the sediment bowl I was replacing. I figured I'd re-use that gasket and screen on another petcock, but when I popped the gasket off the petcock (and it fit just fine) it literally expanded right in front of my eyes. It grew so large it wouldn't fit in the second petcock (or the first one anymore). I've never seen rubber do that so quickly. I ended up having to install another new black rubber gasket. Next time I'm buying cork.

Thanks TST for trying to save my sanity!!

regards,
bob

tst
5+ Years
5+ Years
Posts: 2983
Joined: Tue Jan 12, 2010 2:08 pm
Zip Code: 12514
Circle of Safety: Y

Re: Petcock/sediment bowl conundrum

Postby tst » Thu Dec 06, 2018 6:30 pm

I do not use the rubber ones, have good luck with the cork style

User avatar
IHCFan1950
Cub Star
Cub Star
Posts: 161
Joined: Mon Jun 11, 2018 12:59 pm
Zip Code: 71119
Tractors Owned: 1950 Farmall Cub (Barn fire survivor) "Ruthie"
1951 Farmall Cub
1990 Kubota L2250
Circle of Safety: Y
Location: Shreveport, LA

Re: Petcock/sediment bowl conundrum

Postby IHCFan1950 » Thu Dec 06, 2018 6:56 pm

Went through two brand new ones that did nothing but leak. Finally threw them away and ran straight out of the tank with a quarter turn shut off valve, and further down installed a slip on fuel filter. Problem solved.
If a sharp rap with your hammer doesn't work, you know it's an electrical problem! :lol:

Circle of Safety

staninlowerAL
5+ Years
5+ Years
Posts: 3622
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '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, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: Petcock/sediment bowl conundrum

Postby staninlowerAL » Thu Dec 06, 2018 7:46 pm

[quote="w30bob"]...... but when I popped the gasket off the petcock (and it fit just fine) it literally expanded right in front of my eyes. It grew so large it wouldn't fit in the second petcock (or the first one anymore). I've never seen rubber do that so quickly. I ended up having to install another new black rubber gasket. Next time I'm buying cork.......quote]

I've had similar experience with rubber exposed to gasoline. Try Nitrile gaskets, it's rated for petroleum products use.

jsfarmall
Cub Star!!
Cub Star!!
Posts: 482
Joined: Sat Oct 22, 2016 1:04 pm
Zip Code: 72454

Re: Petcock/sediment bowl conundrum

Postby jsfarmall » Thu Dec 06, 2018 8:30 pm

Start your tractor. It will fix the problem.

User avatar
Glen
5+ Years
5+ Years
Posts: 2808
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Petcock/sediment bowl conundrum

Postby Glen » Fri Dec 07, 2018 12:18 am

Hi,
If gas leaks from the shaft for the shutoff valve on the gas strainer, slightly tighten the special nut on the strainer, where the shaft goes through. There is packing inside, if it the style with packing, and tightening the nut should stop the leaking. Don't overtighten it, it makes the handle hard to turn.
You don't need to replace the strainer because it leaks at the shutoff valve handle, if it is the style with packing.
There is a style with no packing, Jim B. wrote below.

It is easier to get to the strainer if you move the Touch Control arms to the rear position before beginning work on the strainer. :)
Last edited by Glen on Fri Dec 07, 2018 9:40 pm, edited 1 time in total.

w30bob
Cub Star!!
Cub Star!!
Posts: 323
Joined: Fri Dec 08, 2017 4:58 pm
Zip Code: 20634
Tractors Owned: 1959 Farmall Cub
1939 Farmall A
1975 John Deere 301
2015 Kubota BX25DLR
1952 Dodge M37 Weapons Carrier
1955 Willys M38A1
Location: Great Mills, MD

Re: Petcock/sediment bowl conundrum

Postby w30bob » Fri Dec 07, 2018 2:18 am

Hi guys,

Stan......I hear ya about the nitrile.....but you'd think a gasket made specifically for a fuel sediment bowl wouldn't react to fuel. More Chinese junk.

Glen......I did tighten it down, but I guess the little rubber gasket under the fitting was worn out......and it can't be replaced.

I also bought a new petcock last year and it just didn't work......it would not fully shut off the fuel no matter how hard you closed it. Had to send it back.

Regards,
Bob

staninlowerAL
5+ Years
5+ Years
Posts: 3622
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '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, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: Petcock/sediment bowl conundrum

Postby staninlowerAL » Fri Dec 07, 2018 6:30 am

Bob, Waxed Dental Floss is an acceptable packing material. About 3 or 4 wraps around the shaft is usually enough to seal it. As Glen stated, just snug the nut enough to stop the leak.

User avatar
Rick Spivey
Cub Pro
Cub Pro
Posts: 2154
Joined: Sun Jul 01, 2007 10:07 pm
Zip Code: 29518
Circle of Safety: Y
Location: SC, Cades 29518

Re: Petcock/sediment bowl conundrum

Postby Rick Spivey » Fri Dec 07, 2018 7:40 am

I also fixed one with a length of graphite packing found in the plumbing section. Wasn't sure it would work with gas, but it's been there 10 years now....
Rick Spivey
'52 Cub ("Great Personality") 148xxx
'48 Cub with FH ("Gunny Cub") 38xxx
'57 Lambretta (a slow work in progress)
'74 Triumph TR6 (Mama's toy)

w30bob
Cub Star!!
Cub Star!!
Posts: 323
Joined: Fri Dec 08, 2017 4:58 pm
Zip Code: 20634
Tractors Owned: 1959 Farmall Cub
1939 Farmall A
1975 John Deere 301
2015 Kubota BX25DLR
1952 Dodge M37 Weapons Carrier
1955 Willys M38A1
Location: Great Mills, MD

Re: Petcock/sediment bowl conundrum

Postby w30bob » Fri Dec 07, 2018 9:25 am

Hi Guys,

Yes.......great idea on repacking. I thought about it, but the only packing I've seen at the hardware store was the rope packing for water spigots and such.....way too thick for this application. But dental floss is brilliant! I'll also look for the graphite packing when I hit the local hardware store today. Thanks much!!

regards,
bob

Jim Becker
Team Cub
Team Cub
Posts: 13809
Joined: Sun Feb 02, 2003 2:59 pm
Zip Code: 55319
Circle of Safety: Y
Location: MN

Re: Petcock/sediment bowl conundrum

Postby Jim Becker » Fri Dec 07, 2018 11:13 am

Glen wrote:Hi,
If gas leaks from the shaft for the shutoff valve on the gas strainer, slightly tighten the special nut on the strainer, where the shaft goes through. There is packing inside, and tightening the nut should stop the leaking. . . .

Everyone should be aware that this isn't always true. Most of the replacements use a stem packing. However, many of the originals had a back seating valve and no packing. They will leak if you don't completely open the valve, normal behavior.

k hutchins
5+ Years
5+ Years
Posts: 297
Joined: Tue Mar 27, 2012 5:48 pm
Zip Code: 48843
Tractors Owned: 1948 Farmall Cub
193 plow
1948 snow/grading blade
Woods 59 C3
Cub 144 cultivator
Cub 22 mower
Cub 172 one row planter
Original manuals for all the above

Re: Petcock/sediment bowl conundrum

Postby k hutchins » Fri Dec 07, 2018 8:56 pm

FWIW l've always cut my own cork gaskets. Never had a failure.
If you open the petcock a 1/4 turn, then tighten the nut, it will fully seat. Then turn the petcock back off.
Why is there never enough time to do the job right, but always enough time to do it over. :?:


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: ricky racer and 5 guests