Upgrading the fuel system is one of the most impactful modifications you can make to a Nissan 370Z, especially if you’re planning forced induction, nitrous, or even a high-output naturally aspirated build. The factory fuel pump is adequate for stock power levels, but it becomes a bottleneck once you start pushing beyond 350–400 wheel horsepower. An Aeromotive fuel pump offers superior flow, consistent pressure, and the reliability needed for both street and track use. This comprehensive guide covers every step of the installation process, from tools and safety to testing and tuning considerations. Whether you’re a seasoned DIYer or a motivated enthusiast, follow along to ensure a safe, leak-free, and performance-maximizing upgrade.

Tools and Materials Needed

Gathering the right tools and parts beforehand saves frustration and prevents trips to the hardware store mid-job. Aeromotive offers several pump options for the 370Z, including drop-in replacement assemblies and universal inline pumps. For this guide we assume you’re using an Aeromotive 340 Stealth or similar in-tank pump kit. Confirm your kit includes the pump, new harness connectors, hose barbs, and a mounting bracket if applicable.

  • Aeromotive fuel pump kit – Verify part number compatibility with your year 370Z (e.g., Aeromotive 18688 or 16609).
  • Socket set – Metric and SAE, including 10mm, 12mm, and 14mm sockets.
  • Wrenches – Combination wrenches in sizes matching fuel line fittings.
  • Screwdrivers – Flathead and Phillips for trim panels and electrical connectors.
  • Fuel line disconnect tool – Quick-connect release tool for Nissan’s fuel lines (around 5/16″ and 3/8″).
  • Safety glasses and rubber gloves – Fuel is corrosive and flammable; protect your eyes and skin.
  • Shop towels and a fire extinguisher – Have an extinguisher rated for Class B (flammable liquids) nearby.
  • Electrical tape, heat shrink, and wire strippers – For splicing the pump harness if your kit requires it.
  • Multimeter – To verify power and ground after installation.
  • Torque wrench – For retaining ring and fuel line connections (in/lb range).
  • Fuel pressure gauge (optional but recommended) – To confirm pump output matches specifications.

If your 370Z is equipped with a factory fuel pump control module (FPCM), you may also need a wiring harness adapter to maintain proper voltage regulation. Aeromotive’s “Stealth” pumps are designed to work with PWM controllers, but always double-check the documentation.

Preparation and Safety

Working with gasoline requires extreme caution. Even a small spark can ignite fuel vapors. Follow these preparation steps religiously:

  • Park the vehicle on a level, well-ventilated surface, preferably outdoors or in a garage with the door open.
  • Disconnect the negative battery terminal – wait at least 10 minutes for any residual charge to dissipate.
  • Relieve fuel system pressure: Locate the fuel pump fuse in the under‑hood fuse box (position #34 or similar). Remove the fuse, then crank the engine for 5–10 seconds. The engine will start briefly and stall, indicating pressure has been released. Crank once more to confirm.
  • Wrap shop towels around fuel line connections to catch any drips when disconnecting.
  • Keep all sparks, open flames, and electronic devices (phones, laptops) away from the work area.
  • If you smell strong fuel fumes, stop and ventilate the area immediately.

Having a helper can make the process smoother, especially when lowering and maneuvering the fuel pump assembly out of the tank.

Removing the Old Fuel Pump

The 370Z fuel pump is accessed through an inspection panel under the rear seat cushion. No need to drop the fuel tank.

Accessing the Pump

  • Remove the rear seat bottom – firmly pull up at the front edge to release the clips, then slide it forward.
  • Locate the metal access plate (approximately 6×8 inches) on the driver’s side of the floor pan.
  • Use a flathead screwdriver or a panel trim tool to pry off the rubber covers over the bolts (if present). Remove the bolts with a 10mm socket and lift the plate off. Set it aside.

Disconnecting the Old Pump

  • Disconnect electrical connectors: There are two connectors – a large four‑pin connector for pump power and a smaller two‑pin for the fuel level sender. Press the release tabs and pull them apart. Wipe away any dirt or fuel.
  • Detach fuel lines: Using the appropriate fuel line disconnect tool, insert it around the fitting, push toward the pump, and pull the line off. Have towels ready. Label the lines as “feed” and “return” if applicable; on most 370Zs the driver‑side line is the feed.
  • Remove the retaining ring: Using a plastic mallet and a drift punch (or a dedicated fuel pump ring tool), tap the lock ring counterclockwise until it is free. Lift the ring off and set it aside carefully – it will be reused.
  • Extract the pump assembly: Gently lift the assembly out of the tank. The tank opening is narrow; tilt the assembly to slide it out without bending the float arm. Place the assembly on a clean workspace.

Inspect the old pump’s rubber O‑ring and seal condition. If the tank interior shows debris or rust, consider cleaning or replacing the fuel filter sock before installing the new pump.

Installing the Aeromotive Fuel Pump

Now the heart of the upgrade. The Aeromotive pump will likely require slight modifications to the existing hanger assembly because the pump body dimensions and inlet/outlet orientations differ from the factory unit.

Preparing the Hanger

  • Remove the old pump from the hanger by detaching the wiring and fuel line fittings.
  • Compare the new Aeromotive pump’s intake height with the factory pump – you may need to trim the mounting bracket or add a spacer so the pump rests just above the tank floor.
  • If your kit includes a new fuel hose, replace the rubber section that connects the pump outlet to the hanger’s metal tube. Use fuel‑injection‑rated hose and double‑clamp each connection.
  • Re‑attach the fuel level sender to the hanger; ensure the float arm moves freely.

Wiring the Pump

  • Splice the provided Aeromotive wiring harness into the factory pigtail. The Aeromotive pump typically draws 12–15 amps; if your car has a factory FPCM, you may need to bypass it or install a relay kit to ensure full voltage. Many 370Z owners prefer a direct‑feed relay triggered by the factory pump signal.
  • Use heat shrink on all solder joints or high‑quality butt connectors. Secure the wiring along the hanger with zip ties to avoid chafing.
  • Attach the ground wire to a clean chassis ground point near the access hole (a factory ground stud works well).

Sealing and Inserting the Assembly

  • Install a new O‑ring on the fuel tank opening – use the one provided by Aeromotive or a Nissan OEM replacement. Lubricate it with a light coating of gasoline or silicone grease.
  • Carefully lower the assembled pump and hanger into the tank, aligning the orientation marks (usually a notch on the hanger with a corresponding mark on the tank).
  • Press down gently until the assembly is seated. Install the locking ring and tighten it clockwise using the ring tool. Do not overtighten – hand‑tight plus 1/8 turn is usually sufficient.
  • Reconnect the fuel lines: push them onto the fittings until they click securely. Give a gentle tug to confirm.
  • Reconnect the electrical connectors.

Reassembly and Reconnection

  • Replace the metal access plate and tighten the bolts to 70–90 in‑lb (8–10 Nm) – do not overtorque as the floor panel can warp.
  • Reinstall the rear seat cushion. Push down firmly until the clips engage.
  • Reconnect the negative battery terminal.
  • Replace the fuel pump fuse you removed earlier.

Testing and Priming

A thorough test ensures the installation is safe and the pump delivers the expected pressure.

Prime the System

  • Turn the ignition key to the ON position (do not start). You should hear the pump run for 2–3 seconds as it primes. If you do not hear it, check power at the pump connector with a multimeter (should have 12V+ for those few seconds). If there is no power, re‑inspect your wiring and fuse.
  • While the pump is running, listen for unusual noises – a loud whine or rattling indicates debris or improper mounting.

Check for Leaks

  • Inspect all fuel line connections, the O‑ring seal at the tank opening, and the wiring pass‑through. Use a bright light and look for any moisture or drips.
  • If you have a fuel pressure gauge, connect it to the service port on the fuel rail. With the key on (engine off), pressure should rise to 50–55 psi for the 340 pump (check Aeromotive specs).

Start and Drive

  • Once primed and leak‑free, start the engine. It may take a few extra cranks on the first start while the lines fill completely.
  • Let the engine idle for 2–3 minutes, then rev lightly while observing the pressure gauge (if available). The pump should maintain pressure within 2–3 psi of the target.
  • Take a short test drive, varying throttle positions. After the drive, re‑check for leaks and listen for any abnormal pump noise.
  • If the pump runs continuously (even after prime) or the engine runs rich, your 370Z’s ECM may need a tune to compensate for the increased fuel flow. Many owners pair this upgrade with a fuel pressure regulator and an ECU reflash.

Optimizing Performance and Next Steps

An Aeromotive pump alone is a solid upgrade, but for maximum reliability and power you should consider additional fuel system mods:

  • Fuel pressure regulator: A return‑style regulator (e.g., Aeromotive FPR) allows precise pressure control and prevents over‑pressurizing the injectors.
  • Larger fuel lines: For builds exceeding 600 hp, upgrading from the stock 3/8″ lines to 1/2″ or -6AN reduces restriction.
  • ECU tuning: The increased flow rate may require revising the fuel map. Consult a reputable tuner like those at Z1 Motorsports or Specialty Z.
  • Fuel filter: Install a high‑flow inline filter between the pump and the fuel rail to protect injectors.
  • Upgraded injectors: Combine with larger injectors (e.g., ID1050x or DeatschWerks) to fully utilize the pump’s capacity.

For detailed wiring diagrams and 370Z‑specific relay kits, refer to this comprehensive guide on 370ZTech. Additional product specifications can be found on the Aeromotive Fuel Pumps page. For tuning advice, consult Z1 Motorsports’ fuel system upgrades.

Conclusion

Upgrading to an Aeromotive fuel pump on your Nissan 370Z is a rewarding project that lays the foundation for serious power gains. By following this expanded guide, you have the knowledge to complete the installation safely, test the system thoroughly, and plan the next steps in your fuel system development. Always prioritize safety – work in a ventilated area, disconnect the battery, and never rush. With the Aeromotive pump delivering consistent fuel flow, your 370Z will be ready to take on higher boost levels and more aggressive tuning. If you encounter any difficulties, do not hesitate to reach out to the 370Z community or a professional installer. Your engine will thank you.