Originally Posted by lildill9999
i have a 99 f150 and i have replaced the fuel pump,relay,and filter and my pump still wont come on and i have tried to run a wire from the relay to the pump still no power
I hope you've got this fixed by now, but if you haven't, this should help...
Unplug the wire harness that comes directly from the fuel pump. Check to see if you're getting the right voltage at the power side of the harness. If you are getting power, try supplying the voltage directly to the fuel pump via the wire harness with a seperate battery. If you take the pump out of the tank, you could even check the voltage right by the pump to see if that wiring is good. If the direct voltage works, you have a wiring problem before that. If it doesn't turn the pump on, you have a bad pump.