So, my '03 dually quit the other day. Acted up a bit then up and quit. Turn the key on and the lift pump (in the tank) would not run so i replaced the pump and still no go. Turn the key on, and or bump the starter and the lift pump does not do anything. I have 11.55 Volts on the two outside wires at the pump but no pump action. No codes. Seems to me that with 11.55 volts the pump should run. Thoughts??.