Model #917378400 CRAFTSMAN Walk Behind Lawnmower, Gas

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Q:

Primer Leaking 917378400 Craftsman Gas, walk behind lawnmower

A:

Thanks for the inquiry and for using SearsPartsDirect.com.
Sorry to hear of the issue you're having with the fuel flowing from the primer, I know how concerning that is to have occur.
Yes, the primer does have the center hole on it to assist with priming. This type of issue indicates an internal carburetor issue. More specifically, it indicates a stuck needle or flooding issue. To correct this, you will need to pull the carburetor and either perform a cleaning, a rebuild, or replacement depending on how varnished it is inside. 
Once you correct the flooding issue, I would verify and ensure fuel has not mixed with oil, which is a common occurrence with this type of issue. With thinned oil mixture from fuel, it could cause major internal engine damage if ran for extended amounts of time. 
For convenience, I have linked the engine below so that you may view and purchase any of the needed engine parts for this Briggs engine.

Briggs Engine 125K07-0274-E1 Parts Breakdown

Hope this helps and thanks for using SearsPartsDirect.com. We appreciate your business. 

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Jeff Wallace Sr -
Sears Technician
August 04, 2014

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