Just the other day my truck would not start it was in the morning and cold, I park it outside. It would turn over and seem to want to start but nothing. A friend came over and we beat on the gas tank while starting and it started, he thought the pump was going bad. It started and ran the next day with no problems than it did it again the following day. beat on the tank to no avail, so I replaced fuel filter and fuel pump, still no start. The plugs and wires were replaced this past summer. any ideas thanks.