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Hi dennis Sounds like to me that you have a problem with the high speed circuit of the carb...could be some trash in the jet or the jet may be out of adjustment...try adjusting the jet and try to go to full throttle after your adjustment
A bad duckbill vent (the little green thing) inside the fuel cap will cause a vacuum to be created if it is NOT venting to the atmosphere. Odd that all new ones you have used are bad. Maybe try using your old, original fuel cap and the carburetor needs adjusting or at the least; a gaket and diaphragm kit installed. Carb screws are NOT user friendly, thanks to EPA and CARB emissions regulations. You can get onto the heads of them to turn them by tapping a 22 gauge automotive-type plastic wire connector onto the head, and that will give you enough grip to turn them. I would TRY adjusting the carb before getting a kit, but after 2 years or so, a G & D kit is usually needed due to the internals of the carb drying out. If you adjust the carb, this is how the manufacturer says to:
It may just need a G & D kit installed. That is a gasket and diaghragm. Just take the 4 Torx screws out of the rear cover and remove it. You will then be looking at the choke plate assembly which has 2 long screws that go through the housing of the carb and screw into the rear crankcase cover/reed valve assembly. Pull the 2 fuel lines off (noting where they went) and you'll have it. Once you have the carb off, you can get the manufacturer and model # off of it and order a kit. The G&D kit will probably fix what ails it or you can go for a complete rebuild and get a rebuild kit. If the carb is a Zama or Walbro, they sell the kits on Ebay.If the carb has brittle diaghrams inside, replace them; if they are still soft and pliable, then you may only need to clean the carb real well and adjust the H and L mixture screws. They will be plainly marked, but are difficult to remove. Post back for more help!
If it runs with the choke closed then it's not getting enough gas. Check the gas filter on the end of the gas line in the gas tank. Remove the gas cap and using a piece of wire with a hook on the end, reach in the tank and pull the gas line out through the opening. Check the filter on the end of it. You could also have a burst-eddiaphragm in the carburetor. This sucks the gas from the tank to the carb. If that's the case a new weed eater may be in order unless you can find someone with the parts to repair it. Also check the gas lines for leaks or breaks, 2 of them.
double check your carb as it should have a screw for the fuel mixture. some carbs have a plastic piece over them that only lets you move the screws so far if you need more extreme adjustment they pull out about a 1/8th of a inch then you can turn in then push it back in, same principals as making a flame on a bic lighter bigger, if you cant find it take some pics of your carb and email them to me @ email@example.com and i will point them out
Stihl weedeater was running and stopped suddenly. Put in a new fuel filter and cleaner air filter with soap and water. Checked spark plug and it appeared fine. Started the weedeater, ran for a second or so and stopped. Spark plug wasn't gas fouled. Could it be the carburetor needing new diaphram gasket and spring.