Small Engines (Lawn Mowers, etc.): Echo Gas Trimmer, echo gas trimmer, gas string trimmer

Question
I have a Echo gas string trimmer. I have replaced the fuel lines,fuel filter,carb kit,primer bulb,and spark plug. The only way it will crank is if I put gas in the carb and will run for as long as I hold the throttle wide open,but as soon as I let off it dies out. What is wrong with this thing?

Answer
Hello Joseph:

>>Sorry for the Delay. I have been Unable to Answer Questions Due to Health Issues. Thanks for Understanding.
>>You can View a Breakdown/IPL of this Unit at this Site Addy, http://www.smallenginepartswarehouse.com/parts.asp and Select the Shop Online Parts Look Up. Then Select the Model Tab. Then Select the OEM and Enter the Model Numbers (). Then Double Click on the Model in the Results Area. Now you can Select the Section of the Unit you Wish to View.
>>From your Description it Sounds like the Exhaust Port or Muffler (spark Arrester Screen) may be Restricted and Requires Cleaning.
>>The Following is a Basic Instruction File for Doing a Diagnostic on the Engine for this Problem. Any Input is Appreciated.
>>**Remove the Muffler and Make Sure the Exhaust Port is Clear.
>>If it is, then Try to Start the engine with the Muffler Off.
>>If it Starts and Runs Properly, then Clean the Spark Arrestor Screen in the Muffler or Replace the Muffler if Required. Some Mufflers will Split apart for Cleaning of the Screen and Some are Screwed/Bolted to the Outside and on Others the Muffler has to be Replaced.
>>If the Muffler and Exhaust Port are Clean, then
>>The Problem may be in the Carburetor Metering Valve.
>>I Require the OEM (Walbro, Zama, ect) and the Model Numbers Off the Carburetor. With these I can Locate a Breakdown of the Carburetor and Better Assist you.
>>If you Hit a Snag or this Does Not Correct the Problem,  I Hope to be Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Happy. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 5 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Comments and Ratings are Greatly Appreciated. Thanks.

Respectfully

John