help with hot start

[phanatic32212]

Here's the problem. When I start my truck in the morning, It starts no problem. I need to give the gas a tap or two to get it running good, but after that it runs fine. I can drive for a while with no problems. After I shut it down, if I try to start it within 10 minutes it will start right up. But, if I leave it sit for an hour or two, i will turn over but won't start. There is fuel going to the carb. It will eventually start with a good amount of gas, just not like before. I look in the fuel filter and there is little to no gas in the filter, almost like the gas is running back down to the pump. I don't see any leaks or cracks in the line or fuel pump. Any ideas on what would cause this?

Thanks in advance.