I have a 1988 Ford Econoline E150 Van. The power to the fuel pumps in the tanks keeps fluctuating. I think it is the relay but I can’t find the relay’s location.
Click on Fig.21 or 22: http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528007c0bc Location of f/p relay: http://www.autozone.com/N,4294931160/shopping/locsSelect.htm