are we saying in standard configuration there will at no point be sufficient vacuum to activate the FPR, in other words its static at around 4bar from idle to WOT?.
as it would appear from other peoples findings to take a lot of vacuum to make it adjust to 3.2bar, however moving the FPR to the manifold does create sufficient vacuum at Idle and overun to adjust to 3.2bar as the engine is sucking against a closed throttle thus creating the vacuum (which should help MPG little until the ECU adjusts), however going back to the standard set up i just dont see even on a standard or modded inlet that there is sufficient vacuum created to activate/not activate the FPR in any running condition (except a blocked filter, or maybe thats what the airbox trumpet is for). i may have missed it but can some one confirm what the fuel pressure reads on a modded inlet (derestricted air box, vec c pipe, panel filter etc) against a standard set up at idle and WOT not just the vacuum readings, as i struggle to believe at idle the standard inlet is creating a vacuum sufficient to activate the FPR, also have we confirmed exactly how much vacuum is required to activate?