I could be wrong but I think the fuel pressure regulator just keeps pressure in the fuel lines when the car isn't running, so that you don't have to wait for the fuel pump to build enough pressure to start. So if it goes, I think it just takes a bit longer to start, I don't know if it would cause it to not start.
didn't verify whether it was pump or regulator. car has 80,000 miles on it, just decided to change the whole pump assembly and hope it runs for another 80,000. did work myself, pump assembly was 319.00 and new "O" ring was 30.00. hardest part was getting lock ring off that holds pump assembly in. also learned a bad cam position sensor or bad crank position sensor will keep pump from running. bought a scanner and no codes present when initially troubleshooting. after getting car running i was curious to see if bad sensor would keep pump from running, so disconnected the cam position sensor and tried to start car. would not start, fuel pump would only run 1 sec. and stop. reconnected sensor and the car started up. pump location under the back seat is great, sure beats dropping the gas tank to change pump.
@ albiet good job replacing it yourself, plus you saved money iggy: :2cents:
ohh...maybe because the crank position sensor was not the problem there was no code on the scanner. but I wonder if the sensor would send a signal to the computer before it goes bad to be able to diagnose a malfunction in the crank position sensor when is not starting..maybe
the main thing is that she's running!
I have a 2007 and I'm close to 96,000 miles, sometimes before I start my car I have the habbit to listen to that fuel pump buzz... incase she doesn't start then I might know why
to clarify my earlier post on fuel pump repair. after disconnecting camshaft position sensor to see if the code would come up, code p0340 came up. i'm assuming if crankshaft sensor malfunction that code would appear also. cleared code and have been happily driving ever since.