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Subject: Carburator still drips fuel

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NTP    Posted 09-22-2017 at 08:09:02 [URL] [DELETE]        [Reply] [Email]  
  • Carburator still drips fuel
  • I posted down a ways about my carb dripping fuel after rebuilding it. I increased the float setting to 9/32 and it still drips. I then increased it to 5/16 and it still drips. The dripping stops when the engine is running, but then starts to drip out of the hole in the bottom of the carb when I shut it down. It drips both with the new and the old fuel inlet valve. I bushhogged one of my wife's pastures yesterday that was 3-4 feet high in places and the tractor ran just fine. Shut it down and the slow drip started up again. I have another carb and used the float out of that one with the same results. Any ideas of what to try next? Temporarly, I just need to remember to close the fuel shut off when I park it.

    I will rebuild the other carb and see what the results are, but there must be a reason my original carb drips, as it never dripped before I rebuilt it. Any ideas appreciated.

    SAm    Posted 09-22-2017 at 20:09:08 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Carburator still drips fuel
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    Rustyal    Posted 09-22-2017 at 14:23:59 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Carburator still drips fuel
  • I have an 8n that is the same way. You have to cut off the fuel or it is flooded when it sits for a while. I'm assuming it's the valve and seat. The carb doesn't drip cause a previous owner did something to the drain. So the new drain is the air intake. It is on a long list of problem projects.

    steveVa    Posted 09-22-2017 at 10:40:33 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Carburator still drips fuel
  • That issue for me usually ends up being the float valve needle or the float valve seat. I have had just turning the needle 90 degrees fix the problem. I have also had the new seat be the problem and had to try another one.
    Are you using the needle with the rubber tip or the older style that is all metal. I have had more issues with the rubber tipped ones then the old ones.
    I had a stubborn one that I had to test with gravity tank rigged up that was from an old lawn mower so I did not need to keep putting it back on the tractor to test it.
    I had to try 4 or more different combinations of seats and needles till it stopper.
    It can be frustrating. But will be joyful when its fixed...

    R Geiger    Posted 09-22-2017 at 10:17:32 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Carburator still drips fuel
  • You made a mistake when you rebuilt the carb, start over and redo everything, you are missing something.

    HCooke    Posted 09-22-2017 at 10:10:54 [URL] [DELETE]        [Reply] [Email]  
  • Re: Carburator still drips fuel
  • Two things come to mind: Does one of the floats leak? Is the needle seat tightened down real well under it?

    Tim Daley(MI)    Posted 09-22-2017 at 09:18:46 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Carburator still drips fuel
  • I said not to change float setting. 9/32 was the original spec as the 8N Operator's Manual shows a GO/NO-GO gage with GO (minimum) setting at .26 and NO-GO (maximum) at .297". 9/32 (.281") is roughly the mean setting. FORD had carb issues and that's why they came out with the M/S TSX-241-B and C models. Is the leak coming from the 1/8 NPT plug or the sintered bronze weep port? Is the float needle valve inserted and seated with correct gasket? Is the venturi in backwards?

    Tim Daley(MI)

    NTP    Posted 09-23-2017 at 00:37:29 [URL] [DELETE]        [Reply] [Email]  
  • Re: Carburator still drips fuel
  • It leaks from the weep hole. It does not have sintered bronze in the weep hole. It has the horse hair version. Tried both the old solid float valve and the new rubber tipped version. Both drip when the engine is not running. The venture will only fit in the bowl one way because of the different diameter flanges. Adjusting the float settings apparently changes nothing as far as the dripping is concerned. The N carb is a rather simple carb, but I'm missing something.

    Tim Daley(MI)    Posted 09-23-2017 at 06:58:58 [URL] [DELETE]        [Reply] [Email]  
  • Re: Carburator still drips fuel
  • yeah, I forgot and don't always go back to previous post on what the make and model is ...

    Would you be willing to try another carb? I'd try one with a later bronze weep drain plug and see what happens. Maybe the horsehair has run its course. I do not think it is the float setting, nor the solid or rubber tipped float needle valve. You seem to have covered all the bases on possible causes except the drain. Does the carb also have another brass plug near the main drain? I need to ask but if it is the early horsehair drain I'd say no. If it does, when you remove it, do you have drainage flow? Also, when you remove the 1/8-NPT drain plug, open the Fuel Sediment Bulb Valve 2-turns, what does fuel flow look like? When the tractor gets shut down, you are closing the Valve all the way right? If you want to try another carb, I have a M/S TSX-33 carb all recently rebuilt by myself. My email is open...

    Tim Daley(MI)

    NTP    Posted 09-23-2017 at 21:28:07 [URL] [DELETE]        [Reply] [Email]  
  • Re: Carburator still drips fuel
  • Thanks Tim. It is the #33 carb. I do have another carb from a 39 Ford that I recently parted out. I have purchased the larger more complete repair kit and will rebuild it. The carbs do not have the smaller plug located near the drain plug. When I remove the drain plug, I do have a good fuel flow. When I cleaned the carb, I used a ultrasonic cleaner and ran it through 5 eight minute cycles. I then used spray carb cleaner with the straw in the openings, and then blew it out with compressed air. I've had the tractor for about 10 years and never had a dripping problem, even when I "forgot" to close the valve. I only use it for bush hogging, as I have a much newer Ford 1320 with a lot more bells and whistles. I know it is something simple that I may have overlooked.

    TomW    Posted 09-22-2017 at 19:14:34 [URL] [DELETE]        [Reply] [Email]  
  • Re: Carburator still drips fuel
  • I had a carburetor that I could not stop from leaking. Finally I realized that the machining where the gasket for the float seat mated was very rough. Filing it smooth fixed the problem.

    Tom

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