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#1
04-20-2021, 03:03 PM
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Re: Any idea what this is?
Hello,
Today I was mowing my lawn after servicing my B&S 18.5 twin cylinder Engine. model 4h777 About an hour into the cut I noticed a lot of smoke coming out of the exhaust. The engine was also losing power with the cutting deck engaged. When I disengaged the deck the engine would pick up in rpms. I stopped the engine and checked the oil only to find it to be way way over the fill mark and smelt like gasoline. I checked the gas level at the rear of the engine and the tank was empty. Three gallons gone in a mater of one hour. How does three gallons of gas empty into the crankcase in the matter of an hour? Their would have to be a direct path to the crankcase from the tank. The engine starts on first revolution of starter. So far: Plugs are new. Pulse fuel pump is working. Drained and removed filter. Put fresh oil and filter back onto engine. I have removed the carb and cleaned it. The fuel bowl had s lot of junk in the bottom. Disassembled and I used carb cleaner on all the jets and ran fine wire thru all the jets. I reassembled the carb and turned it up side down and blew thru the gas inlet and had no air coming thru needle valve I then turned carb back and was able to blow thru needle valve. I did make the mistake of removing the dip stick while engine was running and got covered in gas/oil mixture. Luckily I was wearing my glasses. Checked compression 125 and 150psi Any ideas where the gas is entering the crankcase? 
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#2
04-20-2021, 04:25 PM
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What Cub Cadet model of Tractor are you referencing ?
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[B]Roland Bedell[/B] CC Models: 100, 105, 1450, 782, (2) 784, & 2072 [SIZE="4"][B][COLOR="Red"]Buy:[/COLOR][COLOR="Blue"] Made in the USA[/COLOR][/B] [/SIZE]:American Flag 1:
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#4
04-21-2021, 09:42 AM
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I would focus on a "fuel pump" (BS-697090).
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[B]Roland Bedell[/B] CC Models: 100, 105, 1450, 782, (2) 784, & 2072 [SIZE="4"][B][COLOR="Red"]Buy:[/COLOR][COLOR="Blue"] Made in the USA[/COLOR][/B] [/SIZE]:American Flag 1:
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#5
04-21-2021, 10:42 AM
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Thanks.
According to the Cub Cadet part list the pump #is BS-597338. It looks to be a none repairable pump. Is there any way to check if it is allowing fuel to dump into the valve cover while its running? or should I shoot the parts cannon at it.  Bill All right then. Found this info on another web site: While engine is running remove pulse tube from top of valve cover and check if fuel is dripping from bottom of tube. Replace pump if it is.
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#6
04-21-2021, 11:47 AM
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Quote:
Parts can be had at any Cub Cadet or Briggs-Stratton Dealers
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[B]Roland Bedell[/B] CC Models: 100, 105, 1450, 782, (2) 784, & 2072 [SIZE="4"][B][COLOR="Red"]Buy:[/COLOR][COLOR="Blue"] Made in the USA[/COLOR][/B] [/SIZE]:American Flag 1:
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.
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