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18hp Briggs engine is burning to much fuel and smells?

We have a 18hp twin cyl briggs mower engine on a countax mower and its burning at least 1-1/2 gallons of fuel extra a day. Its not the float as this operates and the oil is clean. Do you have any suggestions. I noticed that the cyl head pressure operates the fuel pump, if that diaphram has split can oil go into the cyl thay way? I hope you have other things I could try. Thanks Andy

Andy Gamble
July 2008
Briggs & StrattonGarden Tools, Lawn MowersEngine Fuel Mower
floats can look just fine and opperate on bench srip down but that doesent mean they are working.did you acctually test to see if they "float".all your symptoms point to faulty fuel level.either they are not working or someones stealing ur fuel! buy a anew float.and replace all carb diaphrams.£20-£30max

caine
July 2008

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Briggs 18hp Engine - High Fuel Use & Smell