Lawn Mower Not Running Smoothly

I have been having trouble with the a push Briggs and Stratton 5.5 horsepower mower sputtering and not revving to top power. I took the lawn mower apart and found a black plastic piece in the gas tank that was broken, but do not know where it goes. Any ideas?

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By Sophia from Raleigh, NC

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April 29, 20100 found this helpful

Call a lawn mower repair shop to ask them what it might be. Whatever it is, it doesn't belong in your gas tank, that's for sure. :(

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May 1, 20100 found this helpful

Could you post a pic of the lawn mower so I could have an idea of what model engine you have. There are a few different types of the 4.5 Briggs

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January 19, 20120 found this helpful

Try cleaning the air filter.

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0 found this helpful
April 24, 2010 Flag

My Briggs 4.5 powered lawn mower doesn't run smoothly. The engine revs and uses more fuel than it should. I think it is running too rich and that the problem stems from ethanol. Does anyone else experience this problem, and do you know what parts need repair?

Philip from MA

Answers:

Lawn Mower Not Running Smoothly

I use 10% ethanol in the same engine with no problems the rev sounds like a vacuum leak, possibly a bad gasket. It is easy to replace with info from Google or a small engine rebuild manual. (09/18/2008)

By doityourselfer

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