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  1. #1
    Member speedracing944's Avatar
    Join Date
    Jul 2007
    Posts
    30
    Location
    Evansville, WI
    Tractor
    1947 Ford 8N

    Default Ford 8N carb float bowl empty but overflows into intake?

    On a '47 8N I am having a no start issue and I think it has to do with the carb. When I removed the air intake pipe which is between the air cleaner and the carb there was fuel spilling out of the intake pipe. I pulled off the carb and dissasembled it to find the float bowl was bone dry but on the side where the choke butterfly is located was soaked in fuel. The main gasket is in bad shape. I tried to clean out the passages and reassembled the carb. When I reinstalled it the fuel was again spilling into the intake area of the carb.

    Why is the float bowl not filling?
    Is there a rebuild kit or should I just purchase a new carb?

    Thanks,
    Speedy
    1947 Ford 8N
    1983 Porsche 944
    1987 Porsche 944S with Vette Lt1 swap and Mega Squirt II

  2. #2
    Super Member scott_vt's Avatar
    Join Date
    Oct 2004
    Posts
    5,064
    Location
    east wells,vt
    Tractor
    1986 MF 1040, 1942 Farmall A, 1949 Farmall Super A

    Default Re: Ford 8N carb float bowl empty but overflows into intake?

    Afternoon Speedy,
    Im not familiar with that carb but you can get a rebuild kit from Valu-Bilt Tractor quite reasonably. When you disassemble it again to rebuild soak it in carb cleaner and blow all passages. I have rebuilt a few on my old Farmalls and they are fairly easy to do.
    scotty

    ,,,course,,it is gas,and gas is,,well,gas,,so,,but it kills the @#$$ oughta them yellow jackets,,,thingy

    http://www.tractorbynet.com/content/...onth-scott_vt/

  3. #3
    Elite Member RobJ's Avatar
    Join Date
    Jul 2005
    Posts
    3,470
    Location
    Spring, TX (Houston)
    Tractor
    Kubota L2500

    Default Re: Ford 8N carb float bowl empty but overflows into intake?

    That's weird. The fuel should come in directly to the needle valve. When the needle seat goes bad it will fill up the bowl and run into the intake on a gravity feed.

    Maybe a crack? Hook up the fuel line to the carb while holding the carb in your hand (do not bolt to the intake). This way you can look all around it for problems. While doing this you can also remove the bowl and operate the float manually. This'll tell you the condition of the needle seat.

    Good Luck,
    Rob
    L2500

  4. #4
    Gold Member
    Join Date
    Jan 2007
    Posts
    377
    Location
    Ky
    Tractor
    TC55DA

    Default Re: Ford 8N carb float bowl empty but overflows into intake?

    I rebuilt our carb one time it had the same symtoms it was the little jet in the bottom of the float bowl under the main jet that was stopped up .Sounds weird but that would be the first place i would look along with a rebiuld kit. Make shure the rebuild kit has the rubber tiped needle valve for the float . The one we got was all metal and did not seat.I would also check the line between the settling bulb and the carb for fuel it may be stopped up .
    TC55DA 270TL ,Harley rake,Grader box ect ect ect

  5. #5
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    47,884
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Ford 8N carb float bowl empty but overflows into intake?

    The little MS tsx 33 or 241 carbs are pretty easy to rebuild.

    If ya got bad gaskets.. stop right there and get a rebuild kit from TSC.. they got a cheap and a spendy one... your choce as to if you need new needle on the idle or not.. etc.

    Once you get a good gasket, clean and recheck.

    As another poster said, fuel coes in at the flaot needle from the corner elbow and fills the bowl first. my gues sis a bad carb 'halves' gasket.. etc.. and perhaps a stuck/heavy float.

    Beware.. if it has been rebuilt with a viton tip. they can stick after setting a while.. etc.

    Soundguy

  6. #6
    Platinum Member
    Join Date
    Apr 2005
    Posts
    717
    Location
    Erin, Tenn.
    Tractor
    2001 Mahindra 4110

    Default Re: Ford 8N carb float bowl empty but overflows into intake?

    The cast iron Marvel Schebler carbs. of your type have the fuel inlet in the airhorn (upper section) and the needle & seat & float hang down from it. If the bowl is truly dry and you're getting fuel into the throat of the carb., there's a good chance the airhorn is cracked somewhere in the area of the fuel inlet. If the needle or seat were leaking, it could possibly get by the gasket and wet the intake but it would also get some fuel in the bowl as well. Most but not all of these carbs have a pipe plug in the bottom of the bowl, under the main jet. You can remove this plug while mounted on the engine and confirm if fuel is in the bowl or not for sure. Be extremely careful removing any of the brass jetting - it sticks real bad in the cast iron, but does need to be removed for a proper cleaning. I have rebuilt literally hundreds of these carbs. over the years - they were used on many industrial engines as well as tractors. Be extremely careful with the float - they are very hard to find.
    2001 Mahindra 4110, FEL w/5' & 6' QA buckets & forks for the 5', 6' Atlas boxblade, older 6' Howse rotary, Leinbach 7300 PHD w/9" & 12", MF 2/3 bottom plow, 20"x6' bog disc, KK subsoiler, KK middlebuster, Kubota BL60C 5' tiller, Maschio 6' finish mower.

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