My wife and I just got back from Mesquite Airport, working on 703KA. I have been smelling fuel in the cabin, we removed the seat, to check the fuel lines, and found that the header tank is leaking from the two outlets from the pilot side of the tank. The fumes were very strong. When we took the seat up we could see a stain spot on the bottom coving of the plane. It is obiously not a bad leak. However you can see a stain going down the side of the header tank (Pilots Side) and on the skin below the header tank on the Pilots side of the plane. II'll be talking with John Monday!