Something's fishy, Mark. If I let my car sit for days, or a couple weeks, all I have to do is to pump the pedal once, and it fires on first try. Always. How's your timing? If you don't have enough advance at initial, it could crank a bit before catching spark.
If you think it is losing fuel, wait a couple days and then open the air cleaner, poke you head in there, and manually push the throttle plates. Look for gas out of the accelerator pump. If you get some, the issue is not fuel leakage/evap.