It does sound wierd but I have two ideas for you. First put a fuel "T" with a vent line very close to the carb inlet and flush air out of the fuel line right up to the carb when you start the day. Or, if it really, really needs to be primed (hard to believe) mount a small brass inlet tube facing the carb entrance and squirt fuel down it to prime the carb. No removing the cowl either way