No fuel 1987 s10 with 2.8 changed fuel pump fuel pump relay and checked fuse but relay is not picking up when trying to crank

Engine cranking do you have spark at the spark plugs? Do you have fuel injector pulse? Any applicable trouble codes?
As far as the fuel pump, check ecm B fuse. Sometimes that fuse is located under the hood on firewall, close to fuel pump relay, not only check the fuse, use a test lite and check voltage on fuse circuit.
My wiring info for your model year isn't very good.

did you check all fuses with a meter ?
you are new to jeep repairs.... here are some facts.
jeeps have ASD relay.
when car dont start, see what the ASD relay is doing
do not throw parts, you picked the most hard and expensive thing to change on a lark. why do that?
the fuel pressure gauge is $20 and takes 5min to see that fuel pressure is good. not pulling the tank and pump. for fun.
why do that.? (seen 100000 times on forums, this....)
here is mr. ASD, and what to check.
the ASD can cut fuel and spark for many causes. x8

http://www.fixkick.com/Jeeps/ASD.html

automatic shut down relay.

does the relay close cranking? y/n ?
if yes, does it then drop out cranking, y/n?

those are the first 2 tests on all jeeps 1993 to now.

each check discovers what is wrong
so does attaching any OBD2 scan tool and cranking
for 5 long seconds and behold, DTC errors.
got DTC errors cranking/??

BINGO x10.

either check your knock sensor, map sensor or fuel shut-off switch

there is a fuse for the fuel pump plus a relay on the fire wall.

check fuses and relay first if good need to check connections at pump if good strike 3 for pump need to replace

The inline fuel pump fuse on the passenger side firewall is good? Are you jumping it with 12 volts at the test lead or the fuse?

Check your fuse and the fuel pump relay.

check the fuel filter did you change the screen over the pick-up in the fuel tank

check for burnt connections where the relay fits in place.and check for 12 volt to one side of small pins with engine cranking and check for earth to the other small pin at fuel pump relay.

try ecm
added by a91rsinvegas: check the other fuel pump fuse, small black box near the battery connected by and orange wire. Fuse is inside the box.

You'll also want to check the relay. Just because it's new doesn't neccesarily mean it's working. The fuse is an easy fix but not always the problem. Feel the relay while you have someone else turn the car on (not crank) you should feel the relay click to prime the fuel pump. If it doesn't click. The relay isn't coming on. Have your relay checked to make sure it's good. It's not impossible to get a bum part from a parts store, especially if it's autozone or advanced auto parts. They have given me two bad relays, one bad fuel pump, 3 bad alternators and 2 bad O2 sensors. If the relay checks out good, there is a wire going to the relay that should be consistent. Usually orange or red. Check that wire for voltage with the car off, if it isn't getting any, then your problems lies in the wiring, connector, or another problem entirely.