I had the same problem with my 95. Normally, If you turn the ignition on, (not where you turn the engine over) you should hear the fuel pump "humm" for a second or two. If you don't, then your fuel pump switch/relay may be bad. The switch/relay is located in the fuse box under the hood on the driver side. Just to get by I would give the fusebox a hard tap with my nuckles as if I was knocking on someones door. If the ignition is still turned on as I wrote above, you'll hear the fuel pump kick in. The truck can now be started. This is a quick fix however. Replace the switch/relay as soon as possible.