Best thing to do is check your owner's manual. It will show which one is for the fuel pump. Mine is the engine compartment power distribution fuse box and it is a off-white color and is square.
No manual? Try here:-http://www.hillerford.com/research/owner-manuals.html
Ford's directions (for 2003) is disconnect battery cable and to remove the fuel pump relay and turn the engine over until it stops running and continue for about 5 seconds thereafter.
Be careful not to ignite the gasoline, don't cause a spark, don't do it while smoking your pipe or cigs, etc., etc., while doing it. Be prepared for fuel spray possibly and fuel spillage(almost certain).
You will have to retrain the fuel trim/idle since the battery cable was disconnected. See manual for that as well.
I would do that procedure regardless, however especially if I just drove the car.
At least now (on my '03) the connectors are easy to slide off (don't need to remove them)and you don't need to replace them with the old hairpin clips. Remember to put a thin film of clean 5w20 oil on both ends of the fuel filter. I just took some off my dipstick and rubbed it on the filter ends.
You have now saved about $80 especially if you got the filter at a good price.
Hope that helps, unless you did it already.
Best wishes..Scott (Hi from West Bend)