Car wont restart after sitting for 5min ???

Problem: car initially starts and runs fine, however when it sits ((errands)) even for 5 min it wont turn back on crank , crank ,crank?? Could this be related to the carburetor? Heat? Rich/lean? Or?
Has anyone experienced this or have some insight.
Push gas pedal to the floor before starting it. Hold it there till it starts. Could be high float setting allowing fuel to continue to push through the main booster.