Quote Originally Posted by darkhorizon View Post
You have options... There is no magic involved in fuel pressure regulation in the tank/canister, its just about using the 04 or 05+ regulator setup. The "symptoms" of upgraded fuel pumps are unrelated to anything else here.
Quote Originally Posted by alldatadiy

The fuel pressure regulator attaches to the fuel return pipe on the fuel sender assembly. The fuel pressure regulator is a diaphragm-operated relief valve. A software bias compensates the injector on-time because the fuel pressure regulator is not referenced to manifold vacuum. The injector pulse width varies with the signal from the MAP sensor.
So what you're saying is that as that as long as the stock fpr and canister are used the 04-05 that switch pumps should be fine?

I'm trying to figure this out for sure, because Tengis said http://www.grandprixforums.net/fuel-...mps-51491.html
Quote Originally Posted by Tengis
I have a 255lph pump that is drop in for 2004 GPs but I really think 04+ people would be better off going to a junkyard and snatching the return line and fuel rail from a 97-03 car so that you can run a FPR.

I just don't want to run into something like this
Quote Originally Posted by afallucco View Post
No problem, I will say I was surprised to find the added theft deterrent by the car not starting unless I prime the fuel pump a few times lol.
afallucco has an 04 GTP according to his signature.