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Z34 Pump Retrofit

from $34.95
Billet Top Hat Kit:
Installation Hardware Kit:

Upgrading to the modular and versatile Z34-style fuel pump assembly is straightforward with the products on this page. Be sure to review the Fitment and Tech Info details before ordering.

The Z34 fuel pump assembly has proven capable to support up to 700 whp (Dynojet STD) on pump E85 in efficient turbo builds. Even in a supercharged, lower-compression setup, users can expect 500+ whp on pump E85. While these figures are impressive, most 350Z and G35C owners pursue the retrofit for reliability and modularity.

By contrast, the original Z33 pump assembly is notorious for blowing out pump grommets, often leaving the car inoperable. Its internalized plumbing also limits modification potential. The Z34 retrofit eliminates these weaknesses and provides a solid foundation for a clean, “OEM+” style fuel pump system.

The 500.3570 Venturi Hose Adapter is the only hardware required for the base conversion itself. However, most builders will also need to convert the assembly for a return-system configuration. We offer complete return conversion kits for use with either the OEM plastic top hat or our CJM Billet Top Hat.

Upgrading to the modular and versatile Z34-style fuel pump assembly is straightforward with the products on this page. Be sure to review the Fitment and Tech Info details before ordering.

The Z34 fuel pump assembly has proven capable to support up to 700 whp (Dynojet STD) on pump E85 in efficient turbo builds. Even in a supercharged, lower-compression setup, users can expect 500+ whp on pump E85. While these figures are impressive, most 350Z and G35C owners pursue the retrofit for reliability and modularity.

By contrast, the original Z33 pump assembly is notorious for blowing out pump grommets, often leaving the car inoperable. Its internalized plumbing also limits modification potential. The Z34 retrofit eliminates these weaknesses and provides a solid foundation for a clean, “OEM+” style fuel pump system.

The 500.3570 Venturi Hose Adapter is the only hardware required for the base conversion itself. However, most builders will also need to convert the assembly for a return-system configuration. We offer complete return conversion kits for use with either the OEM plastic top hat or our CJM Billet Top Hat.

  • Fuel Pump Assembly Compatibility - Not all 370Z / G37 fuel pump assemblies are the same. It is critical to use a genuine Nissan/Aisan assembly (new or used) if you plan to modify it. Aftermarket budget assemblies are not compatible with available upgrade products.

    • Preferred assembly: 2010+ G37 (part number 17040-1NC0C)

    • Earlier G37 models: Some share the same assembly as the 350Z / G35 Coupe. These would not be applicable for the retrofit.

    • 370Z assemblies: These can be used but require more effort to install. Note that late 2014+ 370Z units switched to a different connector, which adds a wiring challenge if retaining the stock plastic top hat. When using a the billet hat, it would make no difference which connector was on the core assembly.

    Larger Pump Fitment - When using a Walbro 450/525 or other pumps with a larger diameter section, the factory fuel filter must be cut out of the housing for clearance. Because of this modification, a return fuel system with an inline filter is required. CJM S1 kit owners can take advantage of our S1 → S1+ upgrade package to simplify this conversion.

    Vehicle Fitment - This retrofit applies to 350Z and G35 Coupes. For G35 Sedans, please contact us directly for guidance.

  • Scenario A: Stock (Returnless) Fuel System

    • To drop in a 2010+ G37 pump assembly, all you need is our Z34 Retrofit Adapter (the default item on this catalog page).

    • The 2010+ G37 pump assembly shares the same electrical connector and regulator pressure setting as the 350Z / G35C. The connector pinout is also a match.

    • Optional: add our Billet Top Hat Kit for improved reliability — the stock plastic hat is prone to breaking over time.

    • Pump upgrades: our Fuel Pump Installation Kit (500.2026) allows smaller pump upgrades (e.g. 340 LPH pump with 5/16" barb) while reusing the stock integrated filter and regulator.

    • ⚠️ Important: We do not support using a Walbro 450 or larger pump in this configuration.

    Scenario B: Return Fuel System with Stock Plastic Hat

    • Choose the stock hat installation hardware kit in 5/16" or 3/8" to match your pump’s hose barb size.

    • The included 6AN bulkhead serves as the pump output. The original plastic SAE quick-disconnect bulkhead is repurposed for the return line.

    • If installing with our latest CJM S2 fuel system or S1 → S2 upgrade kit, no additional adapters are required.

    • For other/custom fuel systems, these adapters may be useful:

      • 320.0087 — adapts the engine bay end of the fuel pipe to 6AN.

      • 000.4030 — connects the original fuel hose above the tank to the provided 6AN bulkhead.

      • 320.0086 — connects a 6AN return hose to the stock plastic SAE quick-disconnect bulkhead.

    Scenario C: Return Fuel System with CJM Billet Hat

    • Choose the billet hat installation hardware kit in 5/16" or 3/8" to match your pump’s barb size.

    • This hardware kit + the billet hat kit provides:

    • 6AN bulkheads for both feed and return.

    • A QD adapter (from the billet hat kit) to connect the stock fuel pipe to either line.

    • If installing with our latest CJM S2 fuel system or S1 → S2 upgrade kit, no additional adapters are required.

    • For other/custom systems, you may use:

      • 320.0087 — adapts the engine bay end of the fuel pipe to 6AN (when reusing the original pipe for feed or return).