Small Engines (Lawn Mowers, etc.)/Echo string trimmer


I have a CS-306 string trimmer model serial # 02008118.  I have replaced both diaphragms and gaskets, and blew out all the holes in the carb with air.  I did not replace the needle valve.  The tube from gas tank to carb is clear and I cleaned the filter.
When I push the primer bulb, it will not fill with gas.  I put in a new bulb and it still doesn't work.  I can start with starter fluid, but it will not keep running.

Any help will be greatly appreciated.

Is this a Chainsaw?  Do you have a Walbro WT-589 carburetor?  Did you mark the primer bulb fuel line connections before you replaced the primer bulb?  There should have been a short and long nipple on the primer bulb.

Since you did not replace the needle it may be sticking.  Do you have a pressure tester to check the inlet needle pop-off-pressure?


Small Engines (Lawn Mowers, etc.)

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Eric A. Jones


Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.


Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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