i think some one on here was having a weird fuel leak problem - not a normal leak . any conclusion ? have an older ( even older than me ! ) guy , has a 64 era vette ( oem carter carb # 3720 auto , #3721 manual ) . problem is if he parks it for a short while has to pump it extra and then it kicks out alot of black smoke and then settles down ok . if he parks it for 2-3 days then has to pump alot extra , more black smoke , then seems to run ok . from his description he makes it sound like the fuel is dissappearing ? no gas in oil . no external leaks . and like i said this is his explanation . he is familiar with car stuff ( vettes mainly i think ) but by his own addmission not with carb function . and not a good listener when i tell him something or explain something .