I Haven't done anything yet. Too cold up here in Northeast. I was considering calling NHTSA and playing dumb by saying the tank was overflowing and causing a fire hazard. Maybe they could issue a recall. THe earlier trucks with a different system had a similar problem and they were recalled. This system is harder to fix, though. Only way is to pull the tank and replace the FDM (or as some have suggested, lift the bed to get to the FDM). It's a unit, so you can't just replace a check valve. I think Ford has abandoned the dual tank philosophy because they know it has caused problems.
Mike