[hharney]

Paul
Two items to consider, the fuel flow divider and the check valves. I am going through a similar scenario also but instead of the rich, flooded symptoms on start up I have fuel draining out of the cylinders through the small drain tubes from the engine cylinders. I have explored both items above. Changed the check valves, from the return fuel lines back to the tank, in the wing root and this did not solve the problem. You can check these pretty easy and pull them apart. The fuel divider on the top of the engine that distributes the fuel to each injector has a spring that holds a diaphragm closed when there is not pressure in the system. This spring or diaphragm can get weak / tear and will allow fuel to trickle into the cylinders while the engine is off. Are you seeing any oil or fuel dripping from the drain tubes on the rear of the engine cowl?

Here is a test you can try, use the aircraft and when you shut down the engine turn the fuel selector to OFF. The next time you go out see if that changed anything.

BTW, I had the flow divider rebuilt and it still did not quit. This is after I changed the spring, diaphragm and the stem. I had to pull the fuel divider back off and send it back to the rebuild shop and they tested it on the bench fixed it, not sure yet what, and it's hopefully solved the issue. I don't know yet because I am still out of the country but from what my mechanic says.......and Larry is suppose to fly it, it is not leaking.

Anyone else ever have this issue of fuel leaking from the cylinders? Looks like oil but it's fuel.