fuel pump

Thanks for looking. What happened was: In Florida, 95 deg day, towing heavy trailer, A/C on, rusted out tailpipe putting exhaust under bed of truck.... Truck quits, won't restart, appears no gas at TBI, 4.3 six cyl. Get help, trailer home, next day truck towed home and starts & runs fine!! Does that sensor kick out at a certain temp? No code thrown but brake light was on intermittently that day?

What is litre size of engine? Is it diesel? With a diesel, there is 5 volts to that sensor. The sensor controls resistance to ground, cold engine, high resistance. Warm engine, the resistance to ground starts to lower and the 5 volts will start to lower. The computer sees the voltage reading.

The engine is the 4.3 V-Six and not a diesel. So if the sensor works like a resistor it probably has nothing to do with my problem of excess ambient heat. "The computer that sees the voltage reading" I assuume uses that, with other temp sensors to adjust timing, mixture etc. My breakdown was a sharp cutoff, like a broken wire, bad fuel pump, bad coil (what I thought at first) then after a trip on a winch on a ramp truck, the next day, cooler temps and all is well...the truck starts and runs fine. Guessing it could be the relay? Any ideas welcome. Thanks
andygears

My info doesn't show a high temp fuel sensor for gasoline.

An intermittent rpm signal will drive you crazy. It will kill it like flipping a lite switch. How long since a tune-up? Any applicable trouble codes?