vapor lock???????

I must not be calling it the correct term but the gas is bioling in the line that I can see, what would cause this? could the carb be bad or something else. I would not think that it would have anything to do with the ingintion at all but then again I am on this site asking questions. The vehicle wll turn over but it acts like it is flooded and won't catch all the way. Thank you for any help