I have a 91 f150 that after running for a bit and it getting hot does not want to start. i have to let it cool down for like 30 minutes before i can get it to start. When I take off the gas cap there is a big release of gas vapors. any clues as to what it might be or how to fix this? also the oil pressure drops when hot as well.
Best thing to do first, is see if there are any stored codes. Your problem could just as easy be electrical vs fuel related. These older trucks are known to suffer such problems, so pull the codes first, and see what you got there. Here is a how to Ford Fuel Injection » How To Run a Self-Test