According to what you have said, a carb that leaks internally is due to a bad needle and seat. In your case it is just the needle. Try a different needle. I have sometimes tried 3 or 4 needles before I could get one to stop the flow of gas as you have stated. Just remember, internal leaks usually mean a bad needle.

thanks...well I have the carb apart again we're having a needle would it make sense to fill the bowl with water and watch the float and make sure it rises?... its a fifteen-year-old blower and I think the or it might be made of cork..

In rereading you original post I something hit me. Are you storing the snow blower in the proper position, are are you lifting it up to conserve floor space. Some engines are designed to allow them to be placed in a vertical position. Others are not and without modification can leak oil and gasoline.

it's stored as anyone would store it... it just gets rolled into place

Just a FYI---- Your carb operates just like a toilet. It fills with a fluid and there is a float to regulate that and when the float reaches its proper level it raises a stopper to shut the flow of fluid off. If the shut off mechanism is faulty, the float will just keep adding fluid thus overflowing the bowl. If your float is hollow you should check that it has not had gas leak into it making it just a bit heavier and thus harder to float at the proper level when trying to shut off the fuel. Shake the float and see if there is gas inside. Most floats today are made of plastic.

it's cork! when the new needle and brass seat arrive I will fill a carb bowl with some fluid to ensure that we float is indeed a rising.

Most likely the needle and seat have distorted over time as you have previously indicated , ethanol fuel can hasten this aging . A rebuild kit will include this assembly . Also cork will over time become heavier and lose it buoyancy , The fulcrum lever can be adjusted ( tweaked ) to compensate for this .

Yepper ! I still use it , even in regular fuel storage since it is effective for 2 yrs in prevention of stale gas symptoms also .

Definitely use non ethanol gas. Ever since I got the golf course I work at to switch to non corn syrup gas, all the carb issues on the equipment I maintain went away.

well guy named Tom originally recommended that I try to find a new needle and seat. a little disappointed that my local dealer just didn't try this although maybe they didn't have the part handy. I don't know. Cross reference after cross reference I seem to track down the part I put it in and for a week now it shows no signs of leaking. it is warmer out I still am not a hundred percent sure that cold weather doesn't force a plastic part to warp or something and make it leak but for now no leaks.

I'm going to keep this sucker as my backup now since I bought a new one and take my 20 some odd year old simplicity to my in-laws...they have an old noma that doesn't work...post to follow.

Yeah I mentioned ethanol can distort the needle & seat . I have replaced many on various small engine applications . Hard to believe your dealer did not stock a kit !

they're usually pretty good and I've saved me tons of money in the past. they just said that plastic carb is usually more trouble than it was worth and susptable to warpage. they said it was fine on mowers but for some reason acted up on snow blowers. I'm hoping and it continues not to leak! if it does I guess I can put a on off valve on the gas line. maybe I shouldn't have bought a new one but hopefully this will be a dependable backup.

Lawnboy had plastic carbs also that warped causing erratic idle and engine miss issues . The fuel supply shut off valve is a cheap and effective fix / safeguard !

if I understand correctly this is the exact same carb!

It may well be a form of the Lawnboy mower plastic carb . Actually they morphed over the yrs , until they were eventually discontinued .

well the weather would cooperate I'm going to try to get pops old noma running... that's another post I have out there... we'll see what happens with that... thanks for your help.

still no leaks! Just want to thank everyone the simplest solution feels like it was to correct solution all along anyway I also got the noma running I posted another question about that in the forum.