Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Most of these tanks have a grommet in the fuel tank where the line or fitting goes into the tank. This is a rubber grommet that over time can become hard and crack or shrink which will cause it to leak. You most likely just need to replace this grommet which would solve your leaking problem.
This grommet can only be purchased with the on/off valve in a kit from Briggs using part number 192980GS however you can get the grommet by itself through Stens part number 125-336. Any of your local small engine/lawn equipment shops should be able to provide this for you or you can get one online.