Facts are I have a 1981 Corvette, stock (Jasper) engine, all emission, AC etc compontents are in engine compartment and working. I have been having a loss of fuel to carb at times when running on the road, stopping engine for about 5 minutes, refire engine, starts up but then stops and no fuel to carb. Entire fuel system has been gone thru, new AC Delco manual fuel pump installed.

Tom, just looking to get some additional information. When you say you have no fuel to carb, are you looking in the carb for spray or have you removed to line going into the carb?
Rodney

    The answer to your question is yes to both, no fuel from jets in carb and no fuel from line from fuel pump when disconnected. Fuel supply from tank is okay.      Fuel tank has been drained, cleaned and new pickup sock screen installed. Both line between tank and fuel tank blown out, new AC Delco fuel pump, new "S" hose, new line from fuel pump to carb and new (rebuilt) Rodchester carb. And new fuel cap now.

Is  it possible that the rubber S hose is collapsing due to the heat?

Sounds like a classic case of vapor lock. Hard to believe, considering the quality & volatility of the fuels available these days, but it sure sounds like that is what is going on. You've pretty well eliminated everything in the fuel system now...except the fuel itself.
My only suggestion now would be to try to insulate the fuel line from the carb to the pump. The fuel pump could indeed be getting overheated from the oil temp, but...your oil temp seems to be reading waaaay higher than the water temp....that's not normal. Oil temps should be just a little higher, in most cases, than the coolant temp.

  Already had heat wrap tape on the new line from the fuel pump to the carb and did not stop the problem. We removed it since not only would it prevent heat rise it may also not allow for air flow across it to cool it back down. We put everything back to orginial set up to try and better ID the problem.

    On the oil temp higher than the water temp, I too thought that was a wide gap. I am unsure of how the oil temp has been in the past for I rarely looked at it, really monitored the water temp and oil pressure. Car is still at Corvette Etc in Charlotte so I cannot take it back out now and check oil temp right now but that is one item I will monitor in future and see if oil temp is varying at times and when it is at 240/f I lose fuel to carb.

[QUOTE=Adams' Apple]Sounds like a classic case of vapor lock. Hard to believe, considering the quality & volatility of the fuels available these days, but it sure sounds like that is what is going on. You've pretty well eliminated everything in the fuel system now...except the fuel itself.
My only suggestion now would be to try to insulate the fuel line from the carb to the pump. The fuel pump could indeed be getting overheated from the oil temp, but...your oil temp seems to be reading waaaay higher than the water temp....that's not normal. Oil temps should be just a little higher, in most cases, than the coolant temp.
[/QUOTE]

You'll think I've lost my marble(yes, I said marble), but get some of the old-style, wooden clothes pins, and clamp as many as you can on the fuel line from the pump to the carb...see if that helps. If it IS vapor lock, that will solve it, or at least confirm it. It may look stoopid, but, I promise it will work, IF it is vapor lock......

Mechanic called me a bit ago, appears a problem is in the fuel pump's push rod and possible cam lobe......if so can we say "headache # 101"?

I can!!
Can't see the correlation tho, between a worn cam/pushrod, and the running out of fuel when hot only issue....unless it is simply a loss of fuel pressure that allows the fuel to vapor lock.
Chances are, IF the end of the pushrod is worn enough to see any wear, the cam lobe is also worn. Only two options at this point....change the cam & pushrod, or...electric fuel pump. Guess which one I would be doing?