Cycling the ignition on and off as Backbone suggested, if the fuel pump is
not in fact burned out, should prime the fuel system. All you are doing is
turning the fuel pump on and off so as to pump fuel into the fuel lines.
As far as the fuel pump relay, on my 1991 Ranger, it is under the
distribution block on the passenger side of the truck. Now realizing that
my truck is 10 years older than yours, the relay should look the same, and
hopefully be in relatively the same spot. Look for a green and black relay
that are the same beside each other under the distribution block. The green
relay is the fuel pump relay. The inertia switch, or "fuel pump reset", is
under the dash on the passenger side, again this is on my 1991, I don't know
if they changed the location or not. It may be hidden under the carpet,
should look similar to a relay with a reset button on the top of it. If you
can't find it, check the index in your owners manual for "inertia switch",
it should tell you the location.
I agree with Jonah as well though. Too many times if you run the vehicle
low on fuel, you will overheat the fuel pump in the gas tank and it will
die. The idea behind the pump being mounted so low on the pickup is to try
and keep it covered with fuel so as to cool it off, but eventually if the
truck is driven long enough without a fill-up, there will be a period where
it is not submersed in gas.
BTW, your friend has a nice rack :-)