The first pic shows how it was leaking in the wing and down the side of the fuselage. It was only leaking from the inboard tanks, both left and right wings. The second pic shows where the cork gaskets go. The rear gasket was leaking the most--the pic doesn't show how bad the leak really was, because it was wiped clean prior to taking the pic.

Click on the pics for a larger view.

That's exactly what the side of my fuselage looked like. They found the problem, when they installed the fuel senders, they didn't tighten down the screws. Glad that was a simple fix. After all the effort to fix and upgrade during the annual, I hate to think here was another problem I had to fix. Thanks for the input everyone.

Karl

FYI
Be careful that the screws are not over tightened. They cause the light metal on the tanks to pull up. This can cause an irregular surface for the gasket and sender unit to seat.

This has been seen by Craig Griswold of Griswold Aviation on other Cessna aircraft. The Skymaster attach points could be different than what he had to repair on other aircraft but just something to be aware of.