I remember you having trouble with the noisey fuel pump which I said at that time it could have been that it was binding when hot. Did you ever bench test it? If it is in the fuel line, Did you clean or replace the filter in the bottom of your drivers side tank.? I am not talking about the external filter but the one in the bottom of the tank where the feed hose comes off the bottom of the tank. Another thing that can be a common cause is the ignition switch getting hot and the contacts seperating when hot. A starter solenoid can also cause the same problem. Does it cut out completely? Does it start up immediately after it cuts out or do you have to wait a while?