high pressure fuel pump ford f150 v8 injected

High pressure pump runs but will not pump gas have replaced 2x's in 3 weeks. I am draining tank and cleaning it out, have replaced all filtersand the tank pumps works like a champ. I am open to any suggestions.

Founfd the issue to be in the new fuel pumps and that they were flawed. The back pressure relief on the pump was sticking. Manufacturer changed from using a metal bearing to a plastic one and it was swelling and blocking the pump up. Took apart pump and removed that part. Also the motor in the pump was spinning inside itself and put a pin into hold it in place. It takes a little long to crank to start but the truck fires up even in this subzero temps. Better than my neighbors Dodge...lol
The info I found on the pump to assist in repair was in a Jaguar website that has the exact same pump in it. Bosch was the manufacture of this High pressure pump.