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Farmall BN Carburetor

G

gregnohio

New User
have started to restore a 1941 BN of my fathers. The BN will run when we spray starting fluid in the Carburetor, but then dies out. Carburetor has gas in the bowl, however will not run. Gas is line open and sediment bowl is clean.
 
Hold your hand over the air intake of the carb. Does it have a good suction there?? And does your hand get covered with gas?? If you have good suction there but do not get gas on your hand you need to open up the carb and clean it out. If you get gas on your hand it may just start and run. Some times doing the hand trick will pull the junk out of the clogged jet and all will be fine sometimes doing that doesn't work but it is a free try and may save you a few $$ or may not
 
Using old's trick with the hand over the inlet, no gas would indicate a plugged up line or one of the ports in the carb. If you're getting gas and it won't run ex ept when you're sprayin the fluid to it, that would suggest a vacuum leak, wih coould be betwen the manfold and head, or between the maifold and the top of the carb. Try spraying a little of your starter fluid around those two areas while cranking -- if it runs then, you've found the vacuum leak.
 
(quoted from post at 20:23:27 12/02/10) have started to restore a 1941 BN of my fathers. The BN will run when we spray starting fluid in the Carburetor, but then dies out. Carburetor has gas in the bowl, however will not run. Gas is line open and sediment bowl is clean.
Click to expand...

If that tractor sat for quite some time with gas in the carburetor, that gas has now turned into gum and varnish, and nothing short of total dis-assembly and thorough cleaning is going to cure it.
 
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