The drop in pressure can produce misleading symptoms. Mine will start instantly after sitting overnight or less than 15 minutes after stopping the engine. It has a long crank time, (up to five seconds), after the engine has been off more than around 15 - 20 minutes.
Besides waiting for fuel pressure to build up, it may be necessary to clear a flooded condition from leaking fuel before the engine will start. That would be aggravated in higher temperatures. When that fuel is cooler, it will condense and puddle in the intake manifold and will be burned off after the engine starts. In warmer temperatures, it is more likely to vaporize and cause that flooded condition and hard starting.
Sunday, May 22nd, 2011 AT 9:21 PM