Question about Echo CS400 18" Chain Saw

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GS400 engine dies at full throttle, manual says to clean fuel filter and vent but no clue where they are.. only ran 4 tanks of fuel through it before this started all of a sudden, not gradual loss of power, one day after sitting a month it started this problem

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The fuel filter is in the tank, to get it out you need a pair of needle nose pliers to remove it also change the hose going into the tank and into the carburetor the filter costs $2.00 and the hose a Dollar. hope this helps.

Posted on Aug 07, 2010

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Engine dies at full throttle, manual says to clean fuel filter and vent but no clue where they are.. only ran 4 tanks of fuel through it before this started all of a sudden, not gradual loss of power,...


Fuel filter is usually on the end of the "fuel finder" hose inside the tank. The tank vent is USUALLY a small hole in the tank cap.

OFTEN these problems are caused by the diaphram in the fuel pump going bad, or the check valves if it has sat with fuel in it. The diaphram is in the carbureator and works from the vacuum pulses . The check valves are tiny flappers. If you have the problem, a carb rebuild kit is the fix.

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