Fuel pump repair

Have a Chevy Extended Cab Pickup 2002 with 4 wheel drive 1500. It have the V8 vortec? Engine.

A few days ago just as I was pulling out of the drive, the truck sputtered a bit seeming to not be getting fuel. After a few seconds of that it kicked in and all was fine. A few day later it did not even sputter, but simply died. Trying to restart, it would turn over but would not fire. I towed it to a local repair shop who said I needed a new fuel pump (total repair 777.77). Two days after picking the truck up it did the same thing. It would turn over but would not start. After couple of hours I tried it again and it fired just fine I returned the truck to the repair shop and they worked all day finding nothing wrong. As I went to leave the shop it did it again. The service tech came out and tinkere for a couple of minutes then returned with another tech who hit the fuel tank area with a hammer as he turned it over. It fired right up. I left it ther for the next day. Upon returning he showed me a wiring harness that hooks to the fuel pump. It have a sightly burned out socket on it. His contention was that as the fuel pump was going bad, it would draw higher amperage that caused the socket to burn out.

My question is, does this scenario ring true, or did I simply have a bad wiring harness?

By the way the harness repair was another 109.00.

Thanks for any input,

Woody