How to permanently fix a vapor lock problem on my camper/rv?

How to permanently fix a vapor lock problem on my camper/rv? - 1
Added (1). it is a 1986 ford jamboree, the front end is a e-350 with a 460v8 and an auto trans. I am going to replace the fuel pump to see if that works. It has a severe problem with vapor lock.
Added (2). it has an electric fuel pump back by the gas tank beside the fuel filter
Added (3). frankie, the brakes are fine, we just bought the camper and there are no twisty turny roads here. Also the camper won't drive faster than 50 without losing power and slowing down cutting out and backfiring with its vapor lock problem
Added (4). i don't have a problem with the brakes! It is the fuel delivery and vapor lock

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