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Sthil FS 45, Flooding

Bob Campbell's Avatar

Join Date: Aug 2012
Posts: 3

08-14-12, 09:10 PM   #1  
Sthil FS 45, Flooding

OK, Here it is. It died as the gas was almost to the bottom of the tank. I filled the tank and it wouldn't start. I pulled the plug and tested for spark. OK at the plug but fuel sprayed from the spark plug hole when turning it over by starter cord.

Any suggestions as to what to look for when I inspect the carb's inards? I did a carb kit two years ago - $20 got me out the door. Stihl repairman at local hardware store said its not cost effective to fix a unit as it was $50 prepaid
to inspect the unit. Apparently its a throwaway technology.

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cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,573

08-14-12, 11:16 PM   #2  
Most likely the check valve in the carb is bad. The prices of new carbs has really dropped lately and some are about $20 brand new. This might be the better option.

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God bless!

Kriesel's Avatar

Join Date: Dec 2012
Posts: 4

06-03-13, 11:44 AM   #3  
I have a similar problem on my FS45. I initially thought it wouldn't start because the muffler was plugged, but upon taking it off, it was filled with fuel.

Going to get a new carb this week and try that out. Will post back if it fixes the over-fueling issue.

DUKE7759's Avatar

Join Date: Jun 2013
Posts: 22

06-04-13, 05:25 PM   #4  
I think the fs45 used a tank vent. Check that it is clear, sometimes a clogged vent system will create a vaccum in the fuel system and cause it to continue to pull gas like a vapor lock. loosen your gas cap when this happens and if upon release you hear it loose pressure it would be a good sign to check your vent. I hope this helps

Kriesel's Avatar

Join Date: Dec 2012
Posts: 4

06-17-13, 09:15 AM   #5  
I put a new carb on mine ($29 later), instead of rebuilding the carb, and now it starts and runs like a champ! No more flooding...

mowerdude's Avatar

Join Date: Oct 2011
Posts: 433

06-17-13, 11:18 AM   #6  
@ Bob,,the metering diaphram could be hard and holding the needle open allowing fuel to flow into engine causing flooding.

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