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well i think there are only 3 there, on my truck its the one in the middle, i beleive the outside one to the left is tow package i dont remember the right one the cover on top should tell you which is which
I was just rewiring my fuel pump relay last weekend. I've got a '92 F150 so yours may be different but in the power distribution box from closest to driver's side fender:
EEC Power Relay
Fuel Pump Relay
Horn Relay
Trailer Marker Lamps Relay (not used on my truck)
Trailer Battery Charging Circuit Relay (not used on my truck)
[closest to engine]
Most likely it is the one in the second position like Tricked said.