Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Since you had the fuel lines switched it is very possible that you have sucked trash up into the carburetor screen which is causing your running issues now. There is a small screen that serves like a filter inside the carburetor itself, if this screen becomes blocked it will keep the machine from running properly. With the fuel lines switched on the carburetor you have been pulling unfiltered fuel into the carburetor which could stop up the screen.