I have a 99 F250 crewcab and I have been having a problem with diesel leaking out of the drain tube. I have 140,000+ miles on the truck and changed the fuel filter less and 1000 miles ago. When I start it in the morning it drips an excessive amount on the ground then slows down to almost nothing. Took it to the Ford Mechanic couldn't find any problems. Has anyone had this problem, or know how to fix it? What type of Fuel filters do you suggest, NAPA gold is in there now. Thanks