Maybe next time it sits for a week, before you try to start it open the hood, take off the air cleaner, open the throttle all the way by hand while looking into the throat and check if the accelerator pump is squirting fuel down the venturi and if the choke is setting correctly. If the choke came on and the squirters squirted fuel just crank the engine with no pumping of the pedal. Should start and fast idle without touching the gas pedal. If it doesn't squirt fuel and/or the choke does not set, you at least know what direction you have to take to rectify.
No that's not true, old carbs have to be punched to set the choke and high idle, after sitting for a week todays gas with ethanol will evaporate depnding on temps but after returning home and your engine is hot the fuel will evaporate. Also sometimes the fuel could be slowly returning to the tank over a week and air is coming in to the carb while this happens, you still need to goose the pedal to set the choke and high idle cam.