guy, i have a strange one for you. 1 year and 9k miles ago i had the fuel pump and relay replaced in my 1990 k-1500 4x4. its been running perfect until last night. i went to park on a slight hill, had to put it in 4 wheel low to get up it, once at the top i got the truck level and stayed in the truck with it running while talking on my cell phone for 5-10 minutes. turned the truck off, got out while waiting on a buddy to show up, and after 10 minutes decided to start the truck again and get some a/c while waiting for him to show up. thats when the truck didnt start. tried like 5 different times, and nothing. it would turn over fine, but wouldnt start. took the gas cap off, turned the key on, and couldnt hear the pump run for the 2-3 seconds that it usually does. tried that a few more times, then got the pump to run for the 2-3 seconds after the key was turned on, but the truck still would not start. i pulled a spark plug wire off to check for spark, and it was getting really good spark. started arranging for a tow truck, calling some friends, and decided to pull the relay connection off, and re-plug it back in, and did the same to the fuel pump fuse on the firewall near the a/c, under the black plastic cover. then tapped on the throttle body with a ratchet handle, got in the truck and it fired right up.... turned it off 2 more times and it started both times. when my buddy showed up i wanted to show him it now starts, and it would not start..... very frustrating. waited about 30-45 minutes, went back out to the truck, turned the key, and it still would not start up. decided to unplug the fuel pump relay and fuse again, plug them both back in, tap on the throttle body again with the ratchet, and it fired right up..... not wanting to jinx it, i turned it off and and hung out with my friends for about 3 hours. when i wanted to go home, i turned the key and it fired right up and got me home with no problem. so, do you guys have any ideas on what might be the problem ? for the heck of it i am gonna see if autozone will give me a new fuel pump relay and go from there. kind of hard to bring to a mechanic to diagnose if its running good. this one has got me stumped. oh yea, and it has a complete tune up with plugs, wires, rotor, cap, coil, and ignition module, all with 20k miles and 2 years on them. thanks for the help. leonard ---------- Post added at 07:05 AM ---------- Previous post was at 07:02 AM ---------- oh yea, its got a 5.7 v-8 with 130k original miles.