I have a 2000 Ford F150. When I go to start my truck I turn the key to the on position and it doesn't always cycle the fuel pump. I have to turn the key to the off position and back to the on position a few times until it does. What could be the issue.

 

5 Possibilities
1. Fuel pump driver module (located under spare tire)
2. Fuel pump relay
3.PCM
4. Fuel pump itself or wiring/connections
5.Ign sw
maybe I skipped some.