2000 Honda accord

I think that you are having an issue related to heat soak or high engine bay temperatures causing the amount of fuel that the ecu is asking the fuel delivery system to dispense not to be sufficient for a hot start. This can be caused by many separate factors such as aftermarket modification, missing or worn insulation, poor quality fuel, and the list goes on. Its a difficult problem to nail down because of the indirect way that each of the variables can influence the engine. In other words, the ecu may be doing exactly what it is programmed to do, based on the data presented from a plethora of sensors in this case, so no check engine light is present. One example could be rerouting of exhaust components after a turbo upgrade where the new exhaust is placed closer to the intake manifold. While the car is moving and heated air is evacuating from the engine bay the intake manifold stays cool, but when parked the temps rise and when you try and start the car the gasoline, when injected, hits a hot surface, it evaporates, and won't ignite. After 10-15 minutes the temps fall and it will start. That's just one scenario. In that case, if the hot-start enrichment fuel map is influenced by the coolant temp sensor, it wont modify the amount of fuel because the manifold is hotter because its not monitoring those temps for that reason....you can see then how while everything is technically working you could have a problem. More specific information like any aftermarket mods, driving style, location, recent repairs may make receiving the answer that works for you a bit faster. good luck and I hope you get rolling again soon.