Originally Posted by phunk

I can answer that.

You are confusing 2 different purposes. So far, through testing in a couple cars, there have not been any issues with the stock fuel pressure regulato being overwhelmed and needing modification (even after using the walbro install kit to upgrade the pump) such as the 350z required. This is probably because the factory regulator already has a slightly larger output than the 350z did, and the 370z also has a pressure relief valve in the venturi plumbing to prevent pressure bottlenecks from the pinhole venturi nozzles. So you can just install the walbro and run an otherwise stock fuel system and completely ignore the part of the modifications where we removed the factory regulator.

What are you seeing us replace the regulator with a new billet piece is to actually eliminate the factory regulator all-together. The only reason you would do that is to convert the fuel system into a return fuel system with an adjustable regulator in the engine bay or wherever else you mount it. The new billet "nozzle" as you referred to it, is to create a way to send the return fuel into the factory venturis. If you simply returned the fuel to the pump assembly without routing it into where the factory regulator used to dump, the over-tank siphon would die and your car would run out of fuel at a half tank on the gauge because all the gas on the driver side of the "saddle" shaped tank could not be accessed. The new billet nozzle sends the fuel to the factory venturis, and also blocks off the opening in the fuel filter housing that used to feed the factory regulator.

So basically you are seeing two entirely seperate modifications done to the fuel pump assembly in that article. You have the option to do just one or the other, or both, depending on your fuel delivery needs!

I hope that answers your question

Thanks