Quote:
Originally Posted by parish8
I read a comment on a hptuners thread. the poster has experience with di 4 cyl motors and pumps.
he said if you are dropping high fuel pressure at peek tq you are out of hpfp. if you are dropping high fuel pressure at higher rpms you are not feeding it enough fuel with your low pressure fuel system.
even though you may not see a drop in low side fuel pressure it still may not be enough to feed the hpfp at higher rpms.
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Still trying to wrap my head around "the why" of this.