Originally Posted by int_53185
If it was the fuel pump it would run terribly when warm....cold startup is usually the fpr
It'* the other way around. When a FPR fails it is usually the diaphram that leaks causing fuel to be sucked through the vacuum hose into the manifold causing a rich start condition. Somewhat like starting a carburated engine with the choke on (starts fine cold but very difficult warm). This would not apply in the unusual failure of the FPR sticking full open.
A weak fuel pump on the other hand may not be getting enough voltage to pump enough pressure to start the car when the starter is drawing so much voltage during a cold crank. That said, I have seen fuel pumps fail in all differnt conditions.