Last weekend after my fishing trip i put the boat in the basement. After a couple of hours or more there was a strong gas smell. When i went to check it out gas was coming out of the carburator. Last night i went out fishing and left the boat hooked to the truck cause i knew i would be going out again today. Again, i just pop the cap off the motor and there was gas coming from the carburator some 9-10 hours later. What is causing this?????

?? Stuck float??  What motor?

Its a 70 evinrude

Leaking by the needle/seats.  Carbs will need to come off cleaned and new gaskets with needle and seats.   Three kits will cost about $35 if you can do them yourself, about $200 if you have to pay to get them done.  Those are very simple carbs, but a real pain to clean.  I've seen more than one set that had to be taken off a couple of times before the motor would run right after being rebuilt.  I've seen people replace power packs, swearing that's the problem because they think there's nothing wrong with the carbs after putting them back on.