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

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This version of 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 while utilizing the factory fuel rails. This is an economic fuel system upgrade for forced induction applications and provides enough fuel flow to support modest horsepower for forced induction applications.

By retaining the use of the factory fuel rails, this kit can be offered at an excellent cost, making a higher level of horsepower more attainable. Because this system uses the factory fuel rails, it's plumbed in series and returns fuel through the original supply line via Z1's 5-Way Fuel Port. This fuel port includes an OE Fuel Pulsation Damper and is installed in the same position as the original FPD.

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 series configuration since OE rails are retained. Excess fuel is returned through the original supply line to reduce engine bay clutter. All lines come pre-assembled with the appropriate 6AN swivel and quick-disconnect fittings.

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 clamp and stainless steel bracket attach 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

You may choose to add fuel injectors and fuel pump. All optional items include any necessary installation components, such as injector adapters, fuel pump relay kit, and 10mm or 8mm fuel pump hoses. 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.

Fits:

• 2003-2006 Nissan 350Z