I have a basically stock 74 c10. I drove it to work and back twice with no issue. About 20 min each way. A few nights later i drove it roughly the same distance and when i put it in park it died. Went to start it a few hours later and just turned over. Held the throttle wide open and it finally started. Got home no problem. Same thing keeps happening though. I have a clear filter i can see through. So i let it run and after 10-15 min the fuel level drops and goes to almost empty then it dies. First thought was the pump diaphragm was bad so i changed that. Didnt work. Rerouted the fuel line cause it was touching the headers. Now its 6 inches away with a heat sheild. That didnt fix it. Tried running off a gas can incase there was an issue in the fuel tank but the same thing happed. Then i hooked a vaccum gauge to the pump and that read good. Today i insulated the line from the pump to the carb but still no dice. So does anyone have an idea why theres a sudden loss of fuel once the engine is hot? Also its very hard to start or it wont restart at all while its still hot. Im stuck on this one. Thank you to all for any advice on this.