Where do I start with this! Well I suppose, the very beginning. One day my '89 K5 just didn't start. Everything pointed toward the fuel pump, so I changed that and things worked well for a day. It wasn't the fuel pump because I am right back where I started. This is where it gets funny, or should I say confusing. If I hook power directly up to the fuel pump, it starts but this is not safe to go on like this everyday While the truck is running and wires get hooked up normally it keeps running fine. now if I shut the truck off and try it 3 seconds later, it starts back up. But if I wait a minute it won't start again. I have replaced the fuel pump relay and it is still the same. The ECM show no codes. So boys, please help the dummy get back on the road. Thank you.