I have a 66 Caddy at the shop, complaint is that when it gets hot, the fuel is cutting out, fuel box is empty. After about 10 minutes or so, it fires up again and the bowl is full. I checked the main line into the pump, from the tank and it was cracked and I replaced it..... Now here's the problem, it doesn't die now, but you can tell that it is still running out of or low on fuel. I just replaced the pump, last summer, due to a service manager that thinks that's the problem, and wants me to do it again. I hate to charge the guy for a pump again. I can't see how a pump would shut down when it's hot, they just don't do that. A mechanicla pump, is just that, it either works or it doesn't........ It has the symptoms of vapor lock, it sounds like. Just not sure if there's a quick and dirty way to check. Anybody run into this?