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I have a push mower with a Briggs and Stratton 3.5 Classic engine. If I prime the engine, it will start and run until the gasoline with which the engine was primed has burned, then the engine stalls. I have cleaned and gapped the spark plug, replaced the air filter, emptied and refilled the gasoline tank with fresh, unleaded regular gasoline (no ethanol), made sure the carburetor is clean both inside and out, all to no avail. Can you help with this problem, please?

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Check the plastic screen on the bottom of the fuel pick-up tube for plugging. Check the diaphragm/gasket that joins the carburetor body to the fuel tank--it should be defect free and soft. Make sure the carburetor mounting face is not damaged or warped causing an air leak. Check the impulse line that connects from the valve cover to the carburetor (this is what pumps fresh fuel into the carburetor). Hope this helps!

Posted on Jul 29, 2010

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Briggs made primers with and without holes in them. In my shop it is common to see them transposed on engines.
Take down the MODEL TYPE CODE numbers and check here to see if yours should have the primer with or without the hole in it.

Click the Parts Lookup box in the center of that page.
Next, drop down the menu on the left to Briggs & Stratton. Set the tab at the top to MODEL.
Next, type in the model number and click search.
From the results page, select your exact type number. Your individual parts views will then be listed on the right side of the page. You'll get the idea!

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