if so it would be between the door and gas tank inline....prolly back around the tank...itll be round and silver........
Buy a Hayne's manual for the Mercedes diesel or a Chilton's manual for Mercedes (it has a 123 Mercedes on the cover). It will show you how to change the inline fuel filter and the main fuel filter.
It is fairly easy. For the 1984 ford econoline, you follow the fuel line. Keep track of where the fuel goes from dirty to clean. The fuel filter has to be between those two spots.
Under the air filter
Where is the flasher on a 1984 E350
It is located on the right side below the gas cap.
It is located under the drivers side rear door.
.044 inch
If it is carburated (?) maybe in the inlet line of the Carb.
The starter is on the side of the engine at the bottom.
located under the passenger front door.
Ford Econoline
If it has a carburetor the filer is located right where the fuel line connects to the carburetor. You will see a very large bolt. Disconnect the fuel line and then turn this bolt. The filter is behind that bolt held in place with a spring. If it is Fuel Injected the filter in located somewhere between the fuel tank and the fuel rail, unless Pace Arrow installed it in the fuel tank which is possible. You need an owner's manual for this vehicle.