probably the best solution is to let the AEM autotune the map again or tune it by datalogs.
it's unlikely that the pump's contribution to the fuel consumption issue is predicable enough to change the map without re-tuning somewhat.
Thanks Matt. FWIW (and that's precisely why I'm selling the AEM and bought the Adaptronic) I couldn't get the tuner to help me and I've never used the AEM autotune. It just proves the fact that it was too complex for me to use without some help.
I assume I would need to run the car in closed loop for that and I never learned how to.
I faced some AFR issues after dynoing the car. I found myself with AFRs at 15 when going into boost and smelling fuel in the cabin. We checked everything. I bought a new O2 sensor for the wideband and a larger fuel pump (the 255). It turned out to be the fuel filter. By the time we found that out, I had already installed the 255.