ACC? My fuel pump does not turn on unless my key is on RUN, but I am 100% OEM wiring - no workarounds.
If you have no o-ring on a injector it would shoot fuel all over the place.
If the injectors are leaking internally, electrically or from o-rings, the fuel stays in the intake manifold.
EDIT: This is for side feed, sorry I see you are top feed
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