Snapper 5 HP Tecumseh Engine Gas Leak - Snowblower Forum : Snow Blower Forums
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post #1 of 4 Old 09-10-2019, 08:33 AM Thread Starter
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Snapper 5 HP Tecumseh Engine Gas Leak

I have a Snapper Model I524O. Tecumseh Engine HS50-67266H. It leaks gas after I stop running it. What I have been doing is shutting the fuel valve that is below the gas tank and allowing the engine to run dry. It still leaks. Could it still have gas in the carburetor fuel bowl, or a leak in the gas tank, or a leak in the fuel line beneath the gas tank? This has been going on for a few years. I had the carburetor replaced last year because I (incorrectly) thought the carburetor was the source of the leak. But a new carburetor did not correct the leak. I told the small engine repair guy about the leak and it was his idea was to replace the carburetor, but the leak continues. I do not want to use the same repair shop.
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post #2 of 4 Old 09-10-2019, 08:59 AM
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Where exactly is it leaking? Can you tell? From the tank, lines or csrburetor? A couple of good, clear photos may help.
At some point the fuel lines will be dry. The leak will naturally be below that point.


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post #3 of 4 Old 09-10-2019, 10:03 AM
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Originally Posted by JIMMIEM View Post
....Could it still have gas in the carburetor fuel bowl, or a leak in the gas tank, or a leak in the fuel line beneath the gas tank? ...


Yes to all of the above, plus a few more possibilities. So like Micah suggested, you're going to have to narrow it down. I have to say that rarely though, have I ever had a gas leak on a piece of power equipment, that didn't appear obvious after 5 minutes or less examination.

I tend to agree with you about the shop's diagnosis of yet another carburetor. Did he even look at the machine in its present condition before he made that suggestion? If not.....avoid using him again, unless he can claim he's a certified psychic....
In addition to your suspicions about sources for leaks, you can add the fuel shutoff valve to your list, as well as around the hardware that attaches your bowl to the base of the carb, or a drain hole bolt (if there even is one on your present carb).

I take it that the machine runs o.k. and that this must be a very slow leak, or you'd be able to identify the source more easily.

Hardware that attaches to the bowl will typically use some sort of seal like a fiber washer or o-ring. You need to check those. Of course the gasket that seals the bowl to the carb can leak too.

As for the fuel shutoff valve, the valve itself could be leaking, or the valve doesn't really seal off the flow of gas completely and you have a leak further downstream.

If I were trying to locate a leak I literally couldn't see, I'd start at the top. Shove some paper towels under the tank then come back and see if there is evidence of leakage. Even if the gas evaporates you'll still see staining from the gas, or find that the paper feels a little crunchy in spots.

If nothing, wrap a band (small strip) of paper towel around the fuel line just before the shutoff. Examine for evidence of leaks.

Next, wrap the shutoff in a strip of paper towel, and examine after a few hours.

Well, you get the idea-- you just keep working your way downstream.

Additionally, be sure to place some under the bowl to check there.

Rule #1 in diagnosing a problem (whether it's power equipment, cars, computers, software, etc.) NEVER discount the possibility of more than one problem contributing to the symptoms you see. For example, you could have a carb bowl that leaks, and a fuel shutoff that doesn't completely shutoff.

Good luck with your diagnosis, and let us know how it's going.

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Last edited by SayItAintSnow; 09-10-2019 at 12:35 PM.
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post #4 of 4 Old 09-10-2019, 07:13 PM Thread Starter
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Thank You for your replies and suggestions.
The leak 'seems' to be on the gas tank side of the machine. The machine runs fine. Part of the problem is that it is wet all over after using it to clear the snow. I'll run it in the dry warm weather and see what I can see.
Stay tuned.
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