My wife took our 2000 Ford F350 Diesel pickup in to the dealer for new tires and alignment. Dealer says there is a fuel leak at the fuel filter, will cost $88 to repair. Is this something I can do myself? I have looked in the owner's manual that comes with the truck, no help in finding the fuel filter. Looking under the hood and under the engine, nothing looks like a fuel filter there. How hard can this be?