Thanks to this forum, I was able to find part numbers for the Ford "vacuum switch" or "restricted fuel filter sensor" as international calls it. Mine started leaking a bit and after reading through many, many posts I found the info on this part. Thanks to everyone! These trucks can be expensive enough without Ford taking advantage of us.
Fuel Filter Restricted sensor; on filter housing 94/95; on regulator block 96/97
This is the sensor that triggers the "fuel filter" warning light on the dash. Looks like an old fashioned oil pressure sending unit with a single red with white stripe wire attached to the top. On my 97 it is located on the right side of the fuel filter on the fuel pressure regulator block.
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