I am the original owner of a '67 Sea Ray with a 120 Mercury Mercruiser engine (modified Chevy II 153 cu in engine). For perhaps 30 years I have experienced hard starting after several hard runs of 15 minutes or longer. Just turning the key won't start the engine. I have to lift the lever that says "lift for cold start" and then it usually starts at fast idle. I then pull down the cold start lever and sometimes it will die. If it does not die then it will when I attempt to put into forward gear. Very frustrating. I have rebuilt the 2bbl Rochester carb many times over the years and have tuned it up as well. I finally realized after all this time that I may be experiencing vapor lock and thats what is causing my problem after the engine gets warm. What can I do to correct this? I noticed that I have a short hose that connects with a T before the fuel filter and reconnects with a T after the fuel pump. I thought this was supposed to take care of vapor lock. CAN ANYONE HELP ME FIX THIS ANNOYING 30-year-old problem?