Relay is on the firewall, above the AC dryer
You can literally find it in the very first picture of a Google search.
https://www.google.com/search?q=1994+k1500+fuel+pump+relay&client=safari&hl=en-us&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjU3e34iNrMAhVM7CYKHWgqDGwQ_AUICCgC&biw=1024&bih=672