Craftsman Walk-behind Lawn Mower stops running after primed?

thomas martinie, you are not getting any fuel after the prime. Check your carburetor float to make sure it works and check the needle valve to ensure that it works. Check the fuel tank and make sure that you have a vented gas cap. Check the fuel line for any kinks, pinched of areas and internal obstruction. Replace it if it looks old and weathered. If you can give us the engine make and model, we could try and find the right carburetor settings for your mower. Hope this helps, good luck.