Carb Help - Snowblower Forum : Snow Blower Forums
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post #1 of 36 Old 03-03-2016, 04:17 PM Thread Starter
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Carb Help

I bought an old Craftsman snowblower with a Tecumseh engine. Model 536.882502

It was not running when I got it. I removed the carb and cleaned everything. Put it back on, put some gas in the tank and I got a drip from the front of the carb by the choke.

Why? Float bad? Needle stuck somewhere? Ideas?

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post #2 of 36 Old 03-03-2016, 05:38 PM
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Cleaning old carbs can be an exercise in frustration some times. Just when you think you have everything cleaned up, they leak. It might take another cleaning, and maybe a kit, which should include all new gaskets and float needle, if you didn't already install one. From what others say, it might just be easier and cheaper to buy a new replacement carb.

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post #3 of 36 Old 03-03-2016, 05:45 PM
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Could be - the gas we use is not very stable these days..... plus if it had ethanol in it it sucks water in and corroded/rusts the carbs. You need to make sure the needle and the seat/rubber are in good shape and that the float is adjusted tight and working (no holes or leaks). If those things are good, it shouldn't leak/flood. Try adjusting the float a little higher (closing earlier) see if that helps




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post #4 of 36 Old 03-03-2016, 05:46 PM
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Dripping from the mouth of the carb means the fuel level is too high.

You need to set the float level. With the bowl off and your holding the carb upside down the float should be 11/64 from the flange the bowl gasket goes around.

Occasionally that is still too high and you will need to make it a little lower.
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post #5 of 36 Old 03-03-2016, 06:47 PM Thread Starter
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Adjust float level by bending the tab holding the needle?
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post #6 of 36 Old 03-03-2016, 06:56 PM
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Yes. When holding it upside down the tab will rest on the needle. Bend as needed.
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post #7 of 36 Old 03-03-2016, 07:06 PM
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Did you install the needle seat in the correct direction? their is a slight groove on one side. And it faces downward.




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post #8 of 36 Old 03-04-2016, 04:30 PM Thread Starter
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I did install the gasket the correct way. I took everything apart again, rechecked holes, and gaskets. Reassembled, bolted it on and it fired right up and ran okay for a minute or two and then started spilling gas again.
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post #9 of 36 Old 03-05-2016, 02:43 PM
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Quote:
Originally Posted by ColoradoDoug View Post
I did install the gasket the correct way. I took everything apart again, rechecked holes, and gaskets. Reassembled, bolted it on and it fired right up and ran okay for a minute or two and then started spilling gas again.
You might want to try shutting off the gas at the fuel shutoff, then removing the bowl while the carb is installed. If you don't have a shutoff valve, then pinch the fuel line with pliers or vice grips gently to stop the flow.

Have a container to catch fuel under the carb and then open the gas shutoff and hold the float up to see if it stops the flow. ( might need three hands to do this without making to big a mess). If the flow stops when you hold the float up (needle pressing into seat) then you need to do some more adjustment to float height. Also check the float is not sticking as it raises and lowers. If fuel still flows with the float held up, then either the needle or seat is damaged or there's still some crap in the seat or under the seat keeping it from sealing.

It sounds like the float height is off if you are getting overflow with the engine running. Check the gasket at the main jet as well where it holds the bowl onto the carb. That could be leaking. Does your carb have a drain port in the bowl near the main jet? If so, another thing to check. I assume you checked that the float itself doesn't have a leak and is not full of gas?

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Last edited by skutflut; 03-05-2016 at 02:51 PM.
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post #10 of 36 Old 03-05-2016, 06:58 PM Thread Starter
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I will check some more in the morning. I might have to check the float without the bowl. The carb has new gaskets/o-rings. I checked the float and it has no leaks and nothing inside. This snow blower has no fuel shutoff valve, but I think I will get one to make things easier.

More testing in the morning and I will update.

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