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Why does gas splash out of small holes in lawn mower gas cap ?

arwen25's Avatar

Join Date: Jul 2014
Posts: 1

07-05-14, 09:16 PM   #1  
Why does gas splash out of small holes in lawn mower gas cap ?

It is a new Sears push mower. Under the cap is a rubber seal or diaphragm with holes in it. The holes line up so that gas splashes out as I'm mowing. I understand the tank must be vented, but don't want to waste gas.

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Justin Smith's Avatar

Join Date: Dec 2010
Posts: 2,546

07-05-14, 11:06 PM   #2  
They're the vent holes. If it's splashing out you probably have it overfilled.

marksr's Avatar
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Posts: 42,814

07-06-14, 03:59 AM   #3  
I agree, I'll get a little seepage out of my mower's gas cap if I overfill it ... I never figured it was a big deal.
btw - welcome to the forums!

retired painter/contractor avid DIYer

Pilot Dane's Avatar
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Posts: 16,690

07-06-14, 04:50 AM   #4  
If the holes in the rubber are aligned with the holes in the plastic cap you can rotate the rubber with an ice pick or nail so they don't alighn.

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