so the other day i decided to change my heater core in my 96 escort wagon. before i started on the process of changing the heater core my car ran by the time we finished and put the dash back in the fuel pump would not kick on and pump. so heres the deal. i have 10/11 volts at the wiring harness that plugs into the fuel pump and other plugs read 8 volts. but when you plug into the pump and test the power at the pump it has 4 volts on a yellow wire and no volts on the red or black wires. is there something behind the dash causing the fuel pump not to turn on. i hooked the pump directly to the battery and it kicked on please help. ps i replaced the relay switch so its not that either.