Collected about 16 used ones over the years and none of them are any good ( have 3 cars). Given the price of new ones I am toying with the idea of having some made. Someone must have tried this before so wiegh in and tell me why this is a bad idea. Also need advice on fuel additives etc. to keep them clean if the car sits for a while, I seem to remember a post a while ago where a guy put a little 2 cycle oil in the gas, Any input aprreciaated!!