The truck ran nice for a mile then wouldn't gather power and finally stopped. I removed the fuel pump took it to the shop and it pumped fuel but the engine would not start when reassembled. I then poured some gas in the carb and bingo it ran. This pump is about five years old and does not have five house of time on it. What is an expected life span of a fuel pump? Would an electric pump placed before the mechanical pump keep one on the road?