Well, I am back. I have a 1964 Evinrude 40 HP Big Twin. Runs fine at low speeds, cuts back and sometimes stalls after running at high speed for a very short while. I have replaced the fuel pump, fuel lines, plugs, condensor, and points. I have checked inside the gas tank and all is fine. A metal connection goes into the gas tank. There is a screen on the end of it and it is wide open and looks fine. We have noticed air bubbles in the fuel line. They are there at low speeds as well and don't seem to effect the way it runs at low speeds. Does anyone have any further ideas. I appreciate any help. Thanks, Jim