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Tecumseh carb leaking gas out of the vent when idling

Posted by andyma z6%3FMA (My Page) on
Mon, Dec 26, 11 at 19:26

This is the issue that prompted the purchase of the 40 $ Ariens. The carb is on a Tecumseh H60 snow blower engine. It takes about 30 minutes of use before the engine starts to falter. When I took the Bowl off, there was a welch plug sitting in it. I bashed the plug back in and ran the engine. It goes fine at WOT , but at lower RPM starts leaking gas out of the vent. I tested the float, no leaks. I hold the carb upsidedown, I can't blow into the inlet. I turn the carb right side up , the float drops and I can blow into the inlet. I messed around with adjusting the float level, but I really dont know what I'm doing.I am hoping somebody could walk me through the procedure. TIA


Follow-Up Postings:

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RE: Tecumseh carb leaking gas out of the vent when idling

Rule Of Thumbs! The float should be level compared to the bowl's contact to carb when held up-side-down. Most of all, it should stop the intake of gas before it touches the carb. What are the conditions of the needle and seat in the Carb?? loger


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RE: Tecumseh carb leaking gas out of the vent when idling

Thanks Loger, I've had this trouble a while. I'm going to try a new Briggs seat. The 398188 kit works great in the 40$ Ariens. One more question. How should the bowl be positioned? With the low spot toward the needle valve? TIA, Andy


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RE: Tecumseh carb leaking gas out of the vent when idling

The low spot should be positioned to allow the float to drop lower. Correct Techs? Try not to get a seat that will starve the engine for fuel as a swollen seat will do. loger


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RE: Tecumseh carb leaking gas out of the vent when idling

  • Posted by baymee LehighValleyPA (My Page) on
    Tue, Dec 27, 11 at 18:56

The welch plug you found in the bowl is from the bowl vent. I think its only purpose is keep sloshing gas from immediately coming out of the vent hole. It doesn't seal anything.

The lower part of the bowl is for the float to drop to its lowest point, so it goes under that part of the float.

I've run into a few float seats that are compromised by rust, or by ethanol. They hold pressure......sometimes. Always clean the entire system of dirt or rust, install a filter, install a new seat. The grooved part of the seat goes upward.


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RE: Tecumseh carb leaking gas out of the vent when idling

Update : today I rebuilt another carb. It was flooding too , but I think it was just the bowl. I tightened the nut a quarter turn and it seems to have done the trick. In all this goings on,it ran out of gas. No gas, so I dumped in some MMO and a 1/2 bottle of B 12 Chem-tool. Then life intervened and I had to quit playing with it. I'll give it a whirl this weekend. I got cleared to return to work. Yippee!


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RE: Tecumseh carb leaking gas out of the vent when idling

I always set my Tecumseh floats this way:
With the bowl off, turn the carb upside down. With the float in position and everything in place, except the bowl, i hold the carb up to eye level.
As i look at the assembly, i always set the float with a slight tilt upwards at the end opposite the hinge side of the float. Just a wee bit. This makes sure the needle valve will do its proper job when the carb is reassembled and back in its normal position wi8th fuel in the bowl.


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RE: Tecumseh carb leaking gas out of the vent when idling

I going back to work monday. I guess I have worked too long (46 years) I don't get the yippee feeling at all! But, glad I can still work and have Job that's for sure in today's world! maybe the bowl nut being loose alowed siphoning effect causing the leakage????


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