On an 2004 Chilton says it is on top of the fuel tank. However I realized that mine does not seem to have a fuel filter. Dropped the fuel tank and searched the van over many times. Does not have a fuel filter!
Probably somewhere on the driver side of the vehicle, usually under the driver floorboard on the underside of the vehicle. At least that is where it is at on fords. If not there then it will be under the hood usually by the firewall midway up from bottom of vehicle to top, usually favoring the drivers side of the vehicle.