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Help wth Fuel Starved Chainsaw

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Kevin

07-15-2002 19:46:19




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I own a Sears chainsaw - maybe 10 years old. When I finally can get it running, it runs at high speed for a few seconds and then dies. I have noted when pulling the starter cord that no fuel is being drawn into the fuel line from the gas tank. The fuel filter has been replaced, and the fuel line is not clogged. Any idea what the problem could be?




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CJ

07-16-2002 22:37:12




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 Re: Help wth Fuel Starved Chainsaw in reply to Kevin, 07-15-2002 19:46:19  
That is exactly what my Craftsman saw did. It was a cracked fuel line. Cracked where it runs thru the handle. Cheap and easy to replace.



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Russ

07-16-2002 22:32:32




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 Re: Help wth Fuel Starved Chainsaw in reply to Kevin, 07-15-2002 19:46:19  
How about the impulse hose off the crankcase to the carb? If it is cracked you will be sucking air(will run wide open) and the carb will not pump fuel. If you do the carb rebuild, which is a good idea on any two stroke this old, make sure you clean all the passages and orifices thoroughly using spray can solvent. The best I`ve used and I seem to use alot is Walmart`s brand and it`s only 78 cents/can. Good luck and let us know what you find. Russ

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Unimog

07-16-2002 09:23:56




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 Re: Help wth Fuel Starved Chainsaw in reply to Kevin, 07-15-2002 19:46:19  
Make sure the vent in the gas cap is not plugged.
Also I had a similar problem a few years back and
it would start and stall right away. Checked and
no gas seemed to come thur. Checked filter and
lines and went crazy trying to find the trouble.
Finally screwed in a new spark plug started right
up and is still running fine. Good luck.

Unimog



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ferrell freeman

07-16-2002 07:15:35




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 Re: Help wth Fuel Starved Chainsaw in reply to Kevin, 07-15-2002 19:46:19  
You, might want to check the gas tank and see if there is a filter .These will sometimes get stopped up , it is attached to the gas line comming out of the tank and is right on the bottom of tank where all junk stayes.



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Slofr8

07-16-2002 06:23:32




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 Re: Help wth Fuel Starved Chainsaw in reply to Kevin, 07-15-2002 19:46:19  
Kevin, I used to cut wood for my braed and butter back in the day and this is how we would attack a problem like this. It's gonna be a process of elimination starting with the cheapest fix first. The carb kit is a good idea. Then suspect the gas line, it might look good but have small cracks. I never worked on a Sears saw but there should be a gaskit between the carb and the insulater block that connects the carb to the motor and this might be damaged, this is where I found the trouble with my saw last week. This should be included with the carb kit you just put in. If it still races (taking air) that insulater block might have a crack. At this point, if you haven't found you're problem, it's likley the seals on the crankshaft. Using the saw everyday like we did the seals usualy out lasted the saw but I had the case crack on a couple saws causing the same racing problem. They were disasembled and sucsesfully welded. Good luck.

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kevin

07-16-2002 06:21:04




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 Re: Help wth Fuel Starved Chainsaw in reply to Kevin, 07-15-2002 19:46:19  
also check the feul linefor a crack where it goes through the frame, chainsaws are notorious for cracking and sucking air instead.



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Mac

07-16-2002 05:27:57




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 Re: Help wth Fuel Starved Chainsaw in reply to Kevin, 07-15-2002 19:46:19  
Think these are walbro carbs. A simple Rebuild. Only a few bucks.



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John in MA

07-15-2002 21:18:29




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 Re: Help wth Fuel Starved Chainsaw in reply to Kevin, 07-15-2002 19:46:19  
Rebuild the carb. Every old saw I've found has had that problem and has been cured by a kit.



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Greg(Mo)

07-15-2002 20:03:53




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 Re: Help wth Fuel Starved Chainsaw in reply to Kevin, 07-15-2002 19:46:19  
Kevin, the first thing you might want to check is that the muffler is not restricted..it probably has some type of screen in it to arrest sparks.
being that age, it might be pretty plugged up.



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Brad

07-16-2002 22:12:57




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 Re: Re: Help wth Fuel Starved Chainsaw in reply to Greg(Mo), 07-15-2002 20:03:53  
The screen in the exhaust would be the first place I would look as well. I've had weed eater problems that sound just like your chainsaw problems. Chased it forever, tore down the fuel system, ended up being a clogged exhaust screen. Gets boggy and dies at high RPM, and is real sluggish on acceleration, may not even idle sometimes.

Brad



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