We have a 7.3 in an F350 rollback w/ a 5spd. This truck is smoking white smoke badly. It has a fuel smell to it, not antifreeze or oil smell. We have checked to make sure we are not getting exhaust into the water. Did a compression check, all cylinders 200-250psi. Changed out injectors w/ new injectors, and changed out the pump with one from another truck. We used to think we knew alot about these motors, but this one has us stumped. Any ideas before we pull this motor next weekend to put in another?