the fuel pump relay i jumped out to make the pump run.....but when the car starts to make boost and it hits like 2-3 lbs it flops....this jut started out of blue.....it died on me like running out of gas.....thought it wa fuel pump....took it out tested it....ok...then i jumped out relay out it comes on but flops under boot.....i was told about the resistor that control the fuel pump voltage and the brake booster....but why does it work only if relay is jumped out....?????????????please help me fix