Percolation? Heat soak? Don't drive during summer??

Here are the lines from the tank. I don't know if they have ever been replaced.

My fuel guage works just fine, so that shouldn't be a fuel sending unit problem right?

I dont know if my fuel pump has ever been replaced and if it was I don't know when. I have a rubber line that feeds from the metal stock line to the fuel pump, where the line crosses from the frame rail over to the pump.