Posted by Bob on January 05, 2011 at 12:03:30 from (64.255.159.192):
In Reply to: Re: ????????? posted by jdemaris on January 05, 2011 at 11:40:33:
Actually, when the fuel pressure regulator opens it simply bypasses fuel back to the tank. The engine will start and run if the regulator were to stick and NEVER open but the fuel pressure would be HIGH and it would likely overfuel beyond the computer's "fuel trim" range of control.
The REAL cause of a "no-start" with that CPFI system is that there are spring loaded poppet valves at the "nozzle" end of the tubing from each injector and those need a certain amount of fuel pressure to open and flow fuel, much like the "cracking pressure" of a diesel injector.
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