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Leaking fuel injector might well cause difficulty starting after car sit a few hours. White smoke and strong gas smell would also point on leaking injector.
Before you start replacing expensive parts, try to diagnose
the problem a bit further. If it is indeed a leaking fuel injector,
the way to start the car is to floor gas pedal first and start cranking next. Keep pedal steadily floored until it catches up. It will start after about 3 seconds of cranking and should run absolutely normally after that.
This is a "clear flood mode" in ECU and it works quite consistently - I've had a leaking injector for about 9 months before I fugured out the source of the problem.
Leaking injector does not do anything good to the engine (it washes oil out of cylinder walls), but it's not fatal - hey I still have the engine 60k miles later.
Fuel pump is meant to shut off after a few seconds if engine is not running.
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