No you wouldn't expect an overflow if the pump shut off properly, but quite often when you pull the nozzle out there is some amount of fuel left in the hose, that spills out of the nozzle. Might be the source.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.