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Tool Talk Discussion Forum

Chain Saw Keeps quittin'

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Chaney Creek

06-20-2004 03:35:30




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I have a craftsman chain saw that I have had for several years. It starts up ok, runs for about a minute or two and then quits. I work the throttle but can't get it to pick up and run. Seems like it is starvin for gas. It will restart usually without a problem and do the same thing.
Took the carburater apart and cleaned it with spray choke cleaner. How do you get those plugs inside it out without roughing them up or should they be taken out for cleaning behind them. How many turns on the high speed screw, seems like it doesn't have much effect. There is a small hose coming out of the top of the carb, is it supposed to be connected to something?
I have taken the gas line off and fuel flows through it easily. Any suggestions?

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JP

06-22-2004 08:18:18




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 Re: Chain Saw Keeps quittin' in reply to Chaney Creek, 06-20-2004 03:35:30  
If you did not take out the high and low speed needles and clean the carb where they are, then you did not get all the problems resolved. It does have to have some kind of vacumn to run the diaphram, but you are not being real specific on what line is that you are talking about. Does it have a primer on it?? If it has a primer the extra line could be a fuel return line. Take off the carb, look at the mounting gasket, if it is bad shape, it is not sealing and you will get a low amount of vacumn to the pulse port and get tthe problems you are describing.Also, check you fuel lines, Poulan/Craftsman are very bad about fuel lines rotting and breaking and fuel will flow until you need a larger amount of fuel, then the problem flairs up.

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Hound

06-20-2004 18:36:05




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 Re: Chain Saw Keeps quittin' in reply to Chaney Creek, 06-20-2004 03:35:30  
....might be that your oil/gas mixture is too rich. I know that does it for me....just a thought.



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Van in AR

06-20-2004 08:08:19




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 Re: Chain Saw Keeps quittin' in reply to Chaney Creek, 06-20-2004 03:35:30  
The line thats loose from the top of the carb is your impulse line to the crankcase. That senses pulses from the crankcase and moves the diaphram to pump the fuel out of the tank to the carb, If it is disconnected - thats the problem.\
Van



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Ron

06-20-2004 05:51:14




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 Re: Chain Saw Keeps quittin' in reply to Chaney Creek, 06-20-2004 03:35:30  
Some saws provide for the gas tank to vent through the cap, others have an external vent. In either case, yours is clogged.



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MAC,IL

06-20-2004 05:32:18




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 Re: Chain Saw Keeps quittin' in reply to Chaney Creek, 06-20-2004 03:35:30  
Check the gas lines, they may have deteriated. With gas nowadays, a common problem, if it was stored a while with gas in tank. You shouldnt have any loose disconnected hoses.
I wouldnt try to remove those plugs.



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stihltech

06-20-2004 19:00:07




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 Re: Re: Chain Saw Keeps quittin' in reply to MAC,IL, 06-20-2004 05:32:18  
Go with a new pulse hose. Most of the tank vents only let air in, so it is not uncommon for the gas to push out the hose when it is removed.
Spray carb cleaner in the adjustment screw holes, PUT ON YOUR SAFETY GLASSES, and see if it comes out in the throttle bore. The small holes (usually 3) by the plate on the low side, the brass nozzle on the high side. If it does, let the welch plugs be.

Remember to replace the fuel filter. Set the metering lever level with the top of the carbureto, or with the metering chamber floor if the lever sits in a recess.

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chaney creek

06-20-2004 19:32:10




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 Re: Re: Re: Chain Saw Keeps quittin' in reply to stihltech, 06-20-2004 19:00:07  
After the hose comes out of the top of the carb, where does the hose go back into the crankcase?
I looked the other day when I had it apart but couldn't see an opening.



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Ron

06-21-2004 03:55:08




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 Re: Re: Re: Re: Chain Saw Keeps quittin' in reply to chaney creek, 06-20-2004 19:32:10  
Don't waste your time with some "pulse hose". If it were not hooked up, the engine would not run for a minute or two; in fact, it would not run for even a few seconds.

All gas engines have a gas tank vent. Those that see use in high-debris situations like tractors, lawn equipment, and especially chain saws get the vents plugged from time to time. The fact that the engine runs for a minute or two means it can really only be the gradual vacumm that occurs in the tank as gas is pumped out but no air can get in the replace it. The fact that it restarts right away is conclusive proof.

Remove the cap, squirt the heck out of it with B12 Chemtool (yes, even if it's plastic). If that doesn't help, buy a new cap.

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