Z1 Motorsports Nissan 350Z (03-06) VQ35DE Fuel Return System

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Z1's Fuel Return System is a complete bolt-on kit that converts your '03-'06 350Z's returnless fuel system to a return-style fuel system. This is an essential upgrade for forced induction applications and provides enough fuel flow to support in excess of 700hp.

THE RAILS

Z1 Billet Fuel Rails are constructed from 6061 billet aluminum and finished with a black hard anodize. They feature 6AN female ports on both ends of the fuel rail and add two OEM Fuel Pulsation Dampers, included with purchase. These rails were designed to support the use of any OE-style fuel injectors, such as Deatchwerks, Injector Dynamics, etc. Stainless steel allen head hardware attaches the rails to the lower plenum, complimenting the anodized finish while also providing exceptional corrosion resistance. When purchased with our complete fuel system, they're plumbed in a parallel configuration to provide the most consistent fuel rail pressure.

Features:

• Full billet aluminum construction
• 6AN Female Ports on either end of the rail
• Add two OEM fuel pulsation dampers
• 12mm internal rail diameter
• Black hard anodized finish
• Stainless steel allen head hardware

THE LINES

Fuel is delivered to the rails through pre-assembled 6AN lines. The braided stainless steel lines provide structure and protection to the inner, Teflon-coated lines while the black abrasion-resistant PVC coating on the outside prevents the lines from getting frayed or worn as a result of rubbing against suspension members or the frame rails. Fuel is plumbed at the rail in a parallel configuration to provide the most consistent rail pressure. To reduce engine bay clutter, excess fuel is returned through the original supply line and lines are routed to the rails by passing underneath the lower intake plenum. All lines come pre-assembled with the appropriate 6AN swivel and quick-disconnect fittings.

Features:

• Pre-assembled lines include crimped high-quality fittings
• 6AN PTFE core with stainless steel braiding and abrasion-resistant lining
• Parallel configuration provides the most consistent fuel rail pressure

THE REGULATOR

Fuel pressure is controlled using Z1's Adjustable Fuel Pressure Regulator. This regulator has an adjustment range of 40-75 PSI and is easily adjusted underhood with basic hand tools. Included with the regulator is a vehicle-specific mounting bracket that mounts the regulator in a pre-defined position under the hood. A 1/8 NPT port can be found on the front of the regulator body, allowing you to install your favorite fuel pressure gauge in an easy-to-view location. The original in-tank pressure regulator is deleted and replaced with Z1's Billet Regulator Delete.

• Adjustment Range: 40-75 PSI
• Includes vehicle-specific bracket
• Boost/Vacuum reference 1:1
• 1/8" NPT gauge port
• 3x 6AN female ports

THE FILTER

A high-flowing in-line fuel filter is installed in the fuel feed line. This filter features a replaceable ethanol-safe 10-micron stainless mesh element that is safe for use with all pump fuels, including E85. The body of the filter is machined from billet aluminum and protects the filter from impact abrasion under the car. To mount the filter, a billet aluminum bracket is used to attach the filter to existing provisions on the underside of the car.

• 10-Micron replaceable element
• Ethanol-safe filter element
• Billet aluminum clamp and vehicle-specific bracket

OPTIONAL EXTRAS

In the product options, you may also choose to add fuel injectors and/or fuel pump. Please note that if purchasing the Walbro 525 fuel pump, additional modifications of the pump housing and basket will be necessary. This is an extensive installation and details are not covered in the installation manual.

All kits will include a fuel pump service kit to ensure your fuel system is capable of functioning at 100% when installed. This service kit includes Z1's Fuel Pump Grommet and an OEM Fuel Tank O-Ring.

Fits:

• 2003-2006 Nissan 350Z