I have a problem with this engine. It seems that diesel fuel is leaking into the coolant causing an overfull condition of the coolant. The fuel overflows out of the filler cap on the coolant system expansion tank and dribbles all over the engine compartment , the inside of the left front fender and down the left side of the vehicle to the left rear fender. I was wondering if any other owners of this truck have had the same problem and what might be the cause and the solution to this problem. I have taken it once to the Ford dealer where I bought it and the service manager there said he had never heard of this problem.