I am pretty sure Fuel pressure is regulated by the regulator to 2.5bar. 1 bar = 1 atmosphere = 14.7 psi.
This applies at full throttle or part throttle. I am not sure the tolerance spec on fuel pressure. Is that what you are looking for?
Joe Paluch
944 Spec #94 Gina Marie Paper Designs
Arizona Regional 944 Spec Director, National Rules Coordinator
2006 Az Champion - 944 Spec Racer Since 2002