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There are extra complications with the 370z (and 350z) that make installing an external surge can more complicated and expensive than other applications. Personally not being the biggest fan of secondary fuel storage outside the tank, these complications are what pushed me to build the RRP kit. I felt that in the end and for a similar price, most customers would prefer a fully in-tank fix.

The extra complications I refer to include, as mentioned before me, a requirement for return fuel conversion in order to regulate pressure after having taken the stock regulator out of the equation when using a pump outside the tank to provide rail pressure.

An extra complication that is not addressed in common installations of an external surge can to vehicles that were originally returnless, and something that most fuel system builders and product manufacturers have likely never considered, is that the 370z/350z in-tank Venturi siphon is going to cease to function. This can be resolved quite easily by someone who is familiar with the specifics of the (somewhat unique) z33-z34 fuel system, but again, adds more cost.

The 350z doesn't experience fuel starvation to the same severity as the 370z, but I am frequently asked about a fix. My RRP product is much too tall to fit the 350z tank, and I don't believe it would offer sufficient displacement after the dramatic size reduction. Also, the 350z fuel pump module doesn't offer external plumbing to interface, adding extra cost to convert it to a 370z style module such as perhaps borrowed from a G37 (shorter than the Z unit).

Because of this, I have had intentions to create a z33 specific external surge product. While my z34 product cannot be fit to a z33, my z33 product combined with my existing z34 return fuel systems options means that I will have everything in-house to put the external z33 unit into a z34.

I believe the combined hardware between the external surge product, return fuel conversion, and transfer siphon function repair, would meet or exceed my z34 RRP product cost. It will also have no concealability inside the fuel tank, adding the annoyances and risks associated with external secondary fuel storage. But one positive side effect is that after a portion of the expense brings a return fuel system conversion to the table, the end results include a fuel system that has been upgraded to support higher flow/power and also adjustable fuel pressure. All added plumbing being external offers a side benefit of ease to future upgrades to the system, and eliminates the customers/tuners general dependency on CJM to provide clear upgrade instructions as the (mostly misunderstood) RRP demands.

I can play my own devils advocate on the topic of external surge cans versus my RRP kit. If you want to do an external surge can, I can work with you a little on cost and I know how to do it without any 370z-debilitating side effects. I need to build this for the 350z anyway, so I am interested.

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