This is an issue with fuel pressure. With a slightly warm engine the temp sensor, thru the computer, will not turn on the fuel pump. The pressure regulator and check valves in the pumps should hold approx 40# of fuel pressure for 24 hours or so. Your pressure is bleeding off, hence no fuel, and no pump to build up. You can by pass the whole system by just shorting the fuel pump circuit to ground thru the ECCIV test plug. Put a pressure gauge on the fuel and leave it there. I think you will find, that the no start condition when slightly warm, is do to no fuel pressure. For years I had a momentary switch (like a door bell) hooked to my test port, and would just hold it down for a couple of seconds. This used to be most irritating when buying fuel and then be dead by the pumps with guys in line. You have a check valve system in with the fuel pressure regulator and then in ea pump, on the pressure and return sides.
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