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Leaky Carb

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PurduePete

03-20-2006 08:09:55




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I have a carb on a 49 farmall m that i cannot seem to stop leaking! Do the tractor gods have any advice for me? Thanks!




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the tractor vet

03-20-2006 08:45:56




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 Re: Leaky Carb in reply to PurduePete, 03-20-2006 08:09:55  
Dependes here if it is a steady drip all the time then yes you have a problem but if it is a couple of drops after you shut the engine down and you get a couple of wet spots on the floor or dirt then this is normal as when the engine is shut down fuel that is on it's way up the intake stops going up it comes down and it will drip out the weep hole in the bottom of the carb . and it will drip for a bit . Now if it is makeing a big puddel then the neddel valve is not stopen the fuel flow from the tank to the float bowl and either there is dirt getting trapped under the neddel valve and seat or the float is not adjusted correctly or the float has a crack in it and has gas inside of it and is setting on the bottom and alowen the fuel to run free . So first you have to figure out what where the problem is . A lot of times i have found that the littel screen in the bottom of the sediment bowl is missing and there for small pices of dirt will hold the neddel valve open cure for this is get a new screen and clean the fuel tank out and install the screen as this will keep what dirt you did not get out of the tank from getting to the carb. next pull the carb and take it apart and clean it in carb cleaner if you do not feel that this is something that you can do well then take it to some old fart that has been there and done that before and knows what he is doing . Next get a I T manual and read up on just how to remove and replace the carb before you break something or put it on wrong and not get the tab in the correct place and have the engine run away because it was stuck in the full throttel posision .

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RustyFarmall

03-20-2006 08:44:38




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 Re: Leaky Carb in reply to PurduePete, 03-20-2006 08:09:55  
What all have you done up to now?



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Janicholson

03-20-2006 08:44:01




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 Re: Leaky Carb in reply to PurduePete, 03-20-2006 08:09:55  
Beacuse we do not know what you have done so far here is all I know.
Rule 1 always shut off the fuel stop at the tank even if for only a half hour stop.
The needle and seat wear and get sloppy allowing fuel to bypass sometimes and not others.
The float can rub and hang up on the bowl.
The float drop tang can allow the float to drop too far causing leakage.
The bowl can be distorted causing sloshing leaks at the gasket.
The bowl (or top) can have cracks.
The HS needle can have bad packing, or not tightened packing allowing fuel to seep past the screw.
See rule #1
Good luck,
JimN

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