S2 Fuel System, 370Z / G37
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Fitment
Fitment
- 370Z: All models.
- G37: Compatible with G37 models equipped with the 370Z-style fuel-pump module. Some early model-year G37s used the 350Z pump module; this kit will not fit those. If you’re unsure which module you have, email us your VIN and we’ll confirm.
Tech Info
Tech Info
To replicate the factory returnless behavior using your existing tune:
Set base fuel pressure to 52 PSI and leave the regulator reference port unconnected (no vacuum/boost line attached).
For proper return-style operation (recommended):
Connect a vacuum/boost reference line to the regulator for a 1:1 manifold-referenced pressure ratio. This allows fuel pressure to rise and fall with manifold pressure. Consult your tuner before making adjustments.
The CJM S2 Fuel System is a complete return-style fuel system upgrade for the VQ37VHR platform. It replaces the factory fuel rails and all supply-side plumbing with upgraded -6AN PTFE plumbing from the fuel pump module to the engine bay.
Fuel flow improvements begin inside the tank. The factory integrated filter housing is bypassed, allowing fuel to exit the pump module directly out a -6AN bulkhead fitting. Returning fuel is properly integrated into the factory venturi jet-pump system using our billet regulator delete and return conversion hardware.
In the engine bay, CJM billet aluminum fuel rails are rear-fed, eliminating the factory plumbing clutter at the front of the engine. An exposed stainless braided PTFE crossover hose joins the rails in the front, and all external plumbing uses black PVC coating over the stainless braided PTFE hose with crimped aluminum ends for durability and modern fuel compatibility.
An inline CJM 10-micron microglass fuel filter is mounted beneath the vehicle with an included bolt-in bracket. An adjustable 1:1 manifold-referenced regulator controls fuel pressure at the firewall.
The original factory feed pipe is repurposed as the return line. This keeps the underbody installation clean, avoids permanent modification, and allows the vehicle to be returned to stock if desired.
• 370Z: Includes bolt-in regulator mount.
• G37: Uses supplied mounting hardware.
In off-the-shelf configuration, the S2 system has been tested to support 1000+ WHP on E85 when paired with a twin pump setup.
This is a fully engineered return system designed for high power, clean installation, and long-term reliability.
