Posted by Dave41A on April 22, 2020 at 13:12:09 from (67.158.167.127):
In Reply to: Re: Chain Saw Help posted by Dave41A on April 14, 2020 at 07:18:30:
As a follow-up to anyone reading this in the future, the problem was that the impulse hose that runs from the crankcase to the carburetor had become disconnected from the crankcase. As a result, when at idle, there were no "puffs" of pressure or vacuum going down this line, so no fuel was being pumped. The problem did not occur at start-up because the carb vacuum at full or half choke was enough to pull fuel all the way from the tank, even without impulse power to the fuel pump. Now the saw is at least running (and will rev fully), but does not hold a steady idle. I am thinking this is a tune-up problem and will be multiple attempts at fine carb adjustments to get it right. New diaphragms are on order; a new fuel line and impulse line as well.
I discovered this by removing the spark plug and the carburetor. Pulling the start cord while on the workbench produced plenty of vacuum at the crankcase inlet/carb outlet opening, but no vacuum could be felt at the impulse line which hooks to the top (pump) side of the carb. Replacing this line with a small syringe connected directly to the carb impulse connection and pumping by hand brought fuel to the carb. Upon disassembly sure enough, there was the impulse hose, dangling there, disconnected and doing nothing.
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