Small Engines (Lawn Mowers, etc.): Lawn Mower Leaking Gas from Primer Button, groove side, old inlet

Question
My sister gave us a Sears Craftsmean 6.0hp push mower.  It's been sitting in their yard for quite a while, unused, but still looking almost new.

We put gas in it and started it up, it shut down almost immediately.  Gas is also coming out of the primer button, to the point there's no more gas in the tank.

Before I chuck this, is there anything you may be able to suggest as an easy and inexpesive fix, or should we now look for a new lawn mower?  

THANKS!!!

Answer
Most likely the inlet needle, seat and float needs to be replaced.  These parts should cost less than $10 at you local mower repair shop.

You will need to remove the carb.  Pay attention to the connecting links...draw a picture or take a digital pix as you remove the carb.

Dis-assemble the carb and install the new parts.  Remove the old inlet needle seat with a dental tool or pick.  Install the new inlet needle set with the GROOVE side down.

If you have an air compressor I would blow out all the carb orfices.

This should get it going.
Eric