Depends if the van is electrical or mechanical, if it is electrical the fuel pump might either be in the gas tank or mounted on the frame on the drivers side of the van. If it is mechanical then it is mounted to the engine on the lower front passenger side.
top center of engine under/behind air filter housing
in the tank.
The diesel engine that would be in a 2008 Ford E-350 van would be the 6.4L Powerstroke Turbo Diesel V8. This Powerstroke engine got poor fuel economy with about 16mpg highway and 12mpg city.
You need to be more clear as to which "fuel pump" your wanting to know about. The Fuel Injection Pump, or the Fuel Lift Pump ??!!??!!
Do NOT use Diesel fuel in a Ford Focus. The engine will stop running and you will have to drain the gas tank to rid the car of the diesel fuel. Gasoline engines are not designed to run on diesel. They do not have enough compression to cause the diesel fuel to combust The only engine used in a 2000 Ford Focus was the 2.0 which is NOT a diesel engine.
87 octane regular if it is a gasoline engine. Diesel fuel if it has a diesel engine.
passenger side below dash
red diesel or kerosene.
Try under drivers side on the chasis.
Mounted on the engine block.
If the engine cranks and doesn't start it might not be fuel related. The injectors are fired by high pressure oil. If the fuel pump on the rail will not run, there is a relay in the battery junction box and also an inertia switch in the right front kick panel that should be checked.
Only if someone installed a diesel engine. Most Explorers are gasoline engines.