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install a fuel pump guage and check pressure at key on and start, it should hardly vary, it the pressure is constant check the injector signal with a noid light, while you are at it check spark(no spark no injector signal) you won't find a relay fuse
Check fuel pressure, should be no less than 4 psi. The fuel transfer pump is located on frame rail under drivers door, If fuel pump is bad replace it. If that doesn't solve your problem, you may have a bad injection pump. Please rate
check for dryrotted vaccumm lines or off completely ensure all the fuses are good and make sure you have spark by testing it if you need assistance for this send me a reply back sounds as if the fuel is not getting through at this point
definitely could be something smaller. Like a relay....even a filter.
Few things to try:
Just turn the key to on, not start and see if you listening to the fuel tank if you can hear the pump going. If not, its either the pump or the relay.
Most of these trucks have another switch that kicks in after the enigine is started and runs the pump so you may be able to spray starting fluid in it while cranking it and get it to start. Then the other switch may kick in and run it. that will let you know if its the relay or what. Let me know what you find. I just replaced a relay on a 93 and it was only $8.....worth a try. Also, there will be a fuel pump fuse, probably close to the relay, could be that!