Well, I have a 1988 K1500 with the 5.7 and one day that truck sputtered and stalled randomly on the road. Pulled over and she fired back up again only to stall again a few seconds later. Got it towed home and discovered no fuel coming from the pump. Checked the relay and it was fine so I decided to replace the pump and still no fuel. I should also clarify that I know there is no fuel coming out because I still have the tank dropped and is all dissconnected to verify the filter and other parts are not the problem. These models often have very faulty ignition switches so I went ahead and replaced that and STILL nothing...The pump has power and ground so what else it could be is beyond my auto experience. If anyone has any suggestions it would be greatly appreciatted! Thankfully, I get huge price breaks on car parts so this hasnt cost me more then $60 so far, but is very annoying! Thanks in advance for any help!