Quote:
Originally Posted by GambitX
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Enlarging the fuel pressure regulator and swirl jet orifaces in the fuel pump assembly are to increase return side flow to eliminate the fuel pressure spike at idle with a larger fuel pump. When you increase the fuel pump output, the regulator is unable to do its job when the engine is at very low load and idle, causing fuel pressure to spike up until you increase load or RPM.
This modification is only for low engine load/RPM fuel pressure control and will have absolutely no effect on overall output capacity of the pump/assembly. It is unrelated to any pressure drop at the top end... it is only related to maintaining pressure control at idle.