If your lawnmower is losing gas overnight, but there are no visible signs of it, it’s likely your carburetor has a slow leak. Here’s the 5-minute fix.

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Lawnmower Carburetor Leaking Gas? The Quick Fix.
“Didn’t I just ll the gas tank?”, I would ask myself week after week after cutting the lawn. That is, until
I nally realized that there’s a gas leak somewhere!
The reason it took so long to discover the issue is that the gas was leaking so slowly that it was
actually evaporating and not leaving any trace.
Yes, gas evaporation is a thing! There have been studies on it.
When trying to nd the source of the leak, I started at the gas tank. Then I worked my way down
through the fuel line, past the fuel lter and then right behind the air lter box where the carburetor
sits.

2. Yep, My Carburetor is Leaking
Bingo! When I reached my hand behind the air lter box, I could feel that the carburetor was damp
with gas.
My rst thought was, “Dang! I’m gonna have to replace the carburetor.” But carburetors are over
$100, plus whatever time it takes to gure out how to swap it out.
Next thought, rebuilding the carburetor. I’m sure the kits are inexpensive. But it still involves removing
the carb, guring out how to rebuild it, then replacing it.
Then, the most obvious choice hit me while I was sitting there staring at fuel line. An inline shut-o
valve!
$8.75
Rated 4.5 out of 5 by 106 reviewers on Amazon.com
By HIPA
HIPA 494768 698183 Fuel Shut Off Valve with clamp for
Briggs & Stratton Murray Toro Lawn Tractor (Pack of 5)
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3. Inline Shut-o Valves
Not only are shut-o valves inexpensive (about $9 for 5 of them!), but they’re extremely easy to
install.
All you have to do is cut out a segment of your existing fuel line (it’s easiest to do this when your gas
tank is empty) and replace it with the inline shut-o valve.
That’s it! You now just have to get in the habit of shutting o your gas line after each use.

4. Winterization Bonus
As a bonus, this will not only conserve your fuel, but will make winterization one step easier (as you
now have a gas shut o valve).
Just before your last use of the season, turn o the gas line while your engine is running and let it
starve itself out of gas.
This will prevent any residual gas from gumming up your components, especially your carburetor.

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– May 2015