A kinked beer line can cause foaming beer, but this is almost never an issue if you use the proper beer line for your kegerator. If you bought your kegerator new, you’ll note that the beer line is very heavy for its ID (inside diameter) of 3/16”. This type of beer line is almost impossible to kink. But many replace their original beer line with thin wall 3/16” ID line from their local home improvement store and the thinner line is very easy to kink, causing foaming problems. The right answer is to pay a few cents more for proper beer line, even if you have to mail order the line.