Fuel Problem:/

[81Scottsdale520]

So if i drive for a while during in the heat the truck starts to hesitate when at a red light and as i drove off it just died on me. is this a cause from it overheating? because i have see through fuel filters(the one right before or after the fuel pump and the one before the carb) and there was no gas going through at all. so i let it sit for a few hours(4) and i tried it again i had to crank it about 8 times to get the gas to the carb. so my question is, is this a cause from a overheat that shuts off the fuel system or is this from a bad fuel pump? or anything else. I was thinking another possibility was because i have the positive wire from the electric choke directly to the battery. so any help pleaseeeeee