Fuel does not reach fuel rail - 2004 Ford F150

3 thing to check
1.Fuel pump relay
When you turn the igntion key to the on position you should hear a click on then after about 2-3 seconds a click off,your fuel pump will be getting power while the relay is clicked on. If yo dont here a click it could just mean that you have a quite or external relay. If you have a multi meter then you can test this by putting the - to - and the + to + and getting someone to turn the key to the "on" position. If you get a reading then your relay is fine, If your pump is not making a noise go to step 2.
2. Fuel pump is working
What you can do it get 2 small wires and connect it to the fuel pump its self making sure you have the positive and negative correct. Then touch it to the battery, If the pump operates then the pump is fine.
3. Check your filter.
it may be blocked and stopping fuel getting though the filter to the engine.

Let me know how you go please