With fuel spilling out it could be that the float is sticking. Again this is dead ease to correct. remove the bowl, remove the pin holding the float in place and remove the float. You will see that the end of the tip is pointed - clean this with carb cleaner, spray loads of cleaner up the hold that this float valve inserts into, reassemble and test.
In addition to perished/damaged fuel lines it would be worth checking that the fuel overflow tap on the tank is actually drilled. We had a tank that had this blocked. On track as the fuel went down a vacuum was created which starved the carb. Everything pointed to the carb and it was only when we tried to blow fuel by pressurising the tank did we discover the fault.
Graeme
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