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Originally Posted by svxsubaru1
So running a upgraded fuel pump, and running higher fuel presure will be acounted for in the engine managment. I just thought the ECU ran off of a constant fuel presaure and doesnt check up on it, if it were to change.
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No the ECU does not monitor fuel pressure. With the faster fuel pump your fuel pressure is raised accross the board increasing fuel delivery accross the board so that your afr is richer accross the board. At idle and cruise the ecu uses the oxygen sensors to move the afr back to stoichiometric for efficiency. The fuel pressure regulator maintains fuel pressure in relation to manifold pressure. When there is vacuum the fuel pressure is decreased and thus fuel delivery is decreased. As forced induction creates positive manifold pressure fuel pressure increases and thus the amount of fuel delivered increases. This is all mechanical not ecu controlled.