I have run the rear regulator system on several cars, they all started instantly. It takes less than a second for full pressure to the system. Basically by the time the key is turned on and you start cranking the starter you have pressure. No, the pressure doesn't remain in the lines, but it didn't when the regulator was up front on the rails either. I think you could do a one-way valve or specific pump that would hold the pressure for a bit, but most all the aftermarket stuff doesn't. Then again, it's never been a problem with mine that way.
I will say, the cold and hot starts are two areas of tuning that can take a while to get right; it's a balance of cranking fuel, IAC position, temp modifier tables, etc., and with the cold start you only get one try per day to get it tuned.
Jody
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