1954 NAA Ford Carb is leaking out bottom circle? What is it?

8nModesto · Dec 26, 2011

Have a rebuilt Carb for my NAA (1954). Installed it...all fitting tight...but cannot stop leaking out the bottom. Seems to come out of the circle at the bottom of the carb. See Photo of bottom of Carb. Also the drain bolt seems to leak no matter how tight I secure it. Even put thread tape on the bolt... What is the problem do you think? SEE PHOTOS

Jerry/MT · Dec 26, 2011

My guess is your float is not correctly set and fuel bowl is overflowing and causing the sintered plug to drip fuel just like it"s supposed to. AS far as the plug is concerned, does it have the correct threads or are they stripped or worn , etc? I believe they are NPT threads.

GB in MT. · Dec 27, 2011

[b:b5e495d903][i:b5e495d903]
# 1......don't use "thred tape", anywhere to stop fuel leaks!!!! Gas will eat up the tape, in time, and can get into the carb bowl, and start plugging things up!!
Do like Jerry/MT, told ya and run new 1/8 NTP pipe threds in the drain hole......then install a new 1/8 Brass, pipe plug....(obtained from yer local hardware store)!
As for leaking from the bronze weap hole......Check the float setting for 1/4" from the center gasket, to the bottom of the floats!!!!!
BUT.......I suspect, that you have not yet learned to shut off the fuel at the sed. bowl, and the float needle and/or seat is leaking. If that is the case.....install NEW float needle and seat!!!! (the seat has to be really tight, to keep it from leaking, and the needle has to set in the seat correctly, to open and close smoothly!!!

Get into the habit of shutting the fuel off, when you shut the JUBE down for any length of time!!!
Saves gas,....and don't let yer JUBE CARB., leak on yer garage floor!! :lol:

GB

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8nModesto · Dec 27, 2011

Thanks guys..quick question: Is the SINTERED plug Jerry mentioned...the SAME as the DRAIN HOLE PLUG?

FYI I installed a brand new Sed.Assembly (Napa) and, Yes, I shut off the fuel every time.

GB in MT. · Dec 27, 2011

(quoted from post at 08:32:57 12/27/11) Thanks guys..quick question: Is the SINTERED plug Jerry mentioned...the SAME as the DRAIN HOLE PLUG?

FYI I installed a brand new Sed.Assembly (Napa) and, Yes, I shut off the fuel every time.

b:b0f29e6060][i:b0f29e6060]

NO.....the drain plug (hexhead bolt) is to drain fuel only from the carb BOWL......The sintered bronze plug is the weap plug, for draining the overflow from the choke area chamber!!!
Two separate area's of the carb. ....two seperate functions!!!

GB

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JGayman · Dec 27, 2011

"# 1......don't use "thred tape", anywhere to stop fuel leaks!!!! Gas will eat up the tape, in time, and can get into the carb bowl, and start plugging things up!!"

Are you sure about this? I've been using teflon thread tape on fuel lines for decades and never had a problem with gasoline dissolving the tape.

old · Dec 27, 2011

Just a little tip for you and others. When you take thee carb apart pull the main jet adjustment screw out before you take the bottom part off other wise you can end up bending the adjustment screw which then in turn means you have to buy a new one at a cost of around $25

ZANE · Dec 27, 2011

Always turn off the gas valve at the sediment bowl when not using the tractor.

That centered plug is there for a very good reason. If it werent there to drain the excess gasoline out in a couple of days or less the whole tank of gas could end up in the crankcase. It happens!
Close the gas valve when not in use.

Zane

DollarBill · Dec 28, 2011

What the Montana guys sez.......

A couple of possibilities for your leaky carb vent: Float level too high; the needle/seat aint sealing or gas is leaking past the threads of the seat.

Onto your leaky drain plug - Is it possible the gas is flowing from the bronze drain down onto the drain plug and dripping off the plug making you suspect the plug?

1954 NAA Ford Carb is leaking out bottom circle? What is it?

8nModesto

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Jerry/MT

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GB in MT.

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8nModesto

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GB in MT.

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JGayman

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old

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ZANE

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DollarBill

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