Should be hanging off the back side of the air filter box. May be exposed or covered by a rubber/ or plastic cover .

There will be two relay's mounted side by side. They will look almost identical but they aren't.

The one that has a brown base is for the PCM (ECU). The one w/ the green base is for the Fuel pumps.

That's where it is on my 87' 302.



This is what it looks like if the rubber/ or plastic cover still exists, however on a truck where it's mounted on the battery side (unknown year)