When I run the Vette every day or even every other day starting is ok - pump 1 time to set choke and it will fire off.  If I let it set for say 3 days it cranks and cranks to fill the carb.  I do not see leaks from the well plugs.  Is it normal for the fuel to evaporate out of the bowl causing you to crank and pump quite a bit??  Thanks.  Jim