The vent hose is leaking, not the bodies.Are the carb bodies leaking or out the vent hose? Check the rubber "O" rings in the carbs and replace any that are cracking or bloated. A common problem. Be sure the floats move freely and check the adjusted. There is a "sticky" on the clear tube float adjustment.
Good job on the bad fuse.
Hot battery connections is usually caused by a low battery, dirty connections or corroded cables. A good battery should read around 13.5 volts. Try jumping from another vehicle battery. If you have a VOM you can check the cables for voltage drop. Be sure to keep the battery on the trickle charger.
I will take the spark plug out and check for a spark and also i will jump start it off my car to see if it works then?
Is it safe to start whilst fuel is dripping out the carb??? Just want to get it started up first