If the stopping mechanism didn’t click off like it should have, you should let the attendant at the station know about this. While no harm may have been done th is time, but how many people stop at that station? How many cars are going to overflow and spill gas all over the ground? It could be a possible environmental issue if this isn’t put in check. If the attendant doesn’t do anything about it, call the local EPA and inform them of this problem and let them know you told the attendant at the station, but he did nothing about it.