Fuel bubbles?

Hey all. I was driving my 225 Swinger last week. Temps were in the 80's. After bout an hour of driving, I came to a red light. When I stopped the car shut off. I could not get it started. So I had to push it to the side of the road. Then I raised the hood to take a look around. I know this is bad and will change it soon, but I have a see through plastic fuel filter. I could see the fuel bubbling in it. So that got me thinking the car was getting vapor locked or something like that. After about 10 minutes it started and then I drove it home. Now afraid to drive more than 20 minutes at a time. Any idea whats going on? I know CHANGE THE FUEL FILTER FIRST!!!!! Thanks for all help.