Remove the gas cap. Now look for a Schroeder valve on the fuel rail. If there is none, you must relieve it by disconnecting the fuel line at the fuel filter. Be prepared for a spray of fuel. Wrap the connection with a rag to catch the spray.
Where is the engine oil cooler on a 1998 Ford Econoline van E150
it stands for econoline
The seats should be the same.
look under the steering wheel. its a box in the upper left with all the fuses
In the fuel tank.
If it's not in the differential cover then it's in the side of the unit, probably a 3/8 drive square plug.
On the distributor cap
That is the Illuminated Entry Module, 5 amp
There are four, if it's a V-8.
BCI group size 56
Yes there is a Map sensor.
Six cyl or 8 cyl