Introduction: Why the Nissan 370Z Needs a Fuel Pump Upgrade

The Nissan 370Z is widely regarded as one of the best value sports cars on the market, pairing a robust VQ37VHR engine with sharp handling and a visceral driving experience straight from the factory. But for owners who crave more than the stock 332 horsepower, the fuel system quickly becomes a bottleneck. The factory fuel pump is engineered to meet OEM power targets and emissions standards, not to support the additional airflow from bolting on intakes, headers, exhausts, or — most critically — forced induction.

When I first modified my 2015 370Z with a cold air intake and a tune, I noticed the engine stumbling under heavy load above 6,500 rpm. Data logs showed the fuel pressure dropping well below target, a clear sign that the stock pump was running out of capacity. That’s when I began researching high-flow fuel pumps, and the DeatschWerks 250lph (liters per hour) unit stood out for its proven reliability and direct-fit design. After installing it, the difference was immediate and dramatic. This article details my experience and explains why the DeatschWerks 250lph fuel pump is a cornerstone upgrade for any serious 370Z build.

The DeatschWerks 250lph Fuel Pump: Specs and Reputation

DeatschWerks (often abbreviated DW) has been a mainstay in the aftermarket fuel system industry for over two decades. They are known for manufacturing pumps that are rigorously flow-tested and built to handle ethanol blends, extreme temperatures, and sustained high output. The DW200c (commonly referred to as the 250lph pump) is a compact, turbine-style unit that delivers 250 lph at 43 PSI — a substantial improvement over the stock 370Z pump’s approximate 180–200 lph throughput at the same pressure.

Key Specifications

  • Flow Rate: 250 lph (66 GPH) @ 43 PSI
  • Max Pressure: 90 PSI
  • Voltage: 12V, draws approximately 9–10 amps
  • Construction: Direct drop-in for the Nissan 370Z (and many other Nissan/Infiniti applications) with a pre-installed pickup sock and compatible connector
  • Fuel Compatibility: E85, gasoline, and methanol blends

What sets this pump apart from cheaper alternatives is its low current draw and quiet operation. The turbine rotor design reduces noise and heat generation compared to gerotor or vane-style pumps. DeatschWerks also provides a comprehensive installation kit that includes a foam wrap to dampen any whine.

Why Upgrade the Fuel Pump on a 370Z?

Many 370Z owners assume the stock fuel system is adequate for bolt-on modifications. While the factory pump can handle up to around 380–400 wheel horsepower on gasoline with a proper tune, any attempt to push beyond that threshold — especially with E85 or forced induction — demands a higher-flow unit. Here are the most common scenarios where the DeatschWerks 250lph pump is essential:

  • Forced Induction: Supercharger or turbocharger systems require 30–50% more fuel flow. The stock pump cannot maintain pressure under boost, leading to lean conditions that can destroy the engine.
  • E85 Conversion: Ethanol requires roughly 30% more fuel volume than gasoline. A 250lph pump provides enough headroom for E85 on a naturally aspirated build with supporting injectors.
  • Bigger Injectors: If you’ve upgraded to 750cc or 1000cc injectors, the stock pump can’t supply enough volume at higher duty cycles.
  • High-RPM Reliability: Even on a bolt-on car, the factory pump’s pressure tends to drop above 6,000 RPM, causing erratic air-fuel ratios. The DW pump holds rock-solid pressure all the way to redline.

Installation: Step-by-Step Guide for the 370Z

One of the best features of the DeatschWerks 250lph pump is that it is a direct-fit replacement. No wiring modifications or fuel hanger alterations are needed. The entire job can be completed in an afternoon with basic hand tools. I performed the installation myself in my garage, and here is the detailed process I followed.

Tools and Materials Needed

  • Socket set (including 10mm, 12mm, and 14mm sockets)
  • Flathead and Phillips screwdrivers
  • Fuel line disconnect tool (3/8″ and 5/16″)
  • Torque wrench (for fuel pump assembly bolts)
  • Safety glasses and gloves
  • Shop rags and a fire extinguisher (safety first)
  • DeatschWerks 250lph pump (DW200c) and included foam insulation

Safety Precautions

Fuel systems are under pressure and contain flammable vapor. Always work in a well-ventilated area, disconnect the battery negative terminal, and relieve fuel pressure before opening the lines. Have a fire extinguisher nearby.

Installation Steps

  1. Relieve Fuel Pressure: Locate the fuel pump fuse in the under-hood fuse box (position 19) and remove it. Start the engine and let it idle until it stalls. Crank the engine for a few more seconds to purge residual pressure.
  2. Disconnect Battery: Remove the negative battery terminal to prevent any electrical shorts.
  3. Access the Fuel Pump: Fold down the rear seats. On the driver’s side, there is a rectangular plastic cover (secured by two 10mm bolts). Remove it to reveal the fuel pump access plate. Carefully pull back the sound deadening foam.
  4. Remove the Fuel Pump Assembly: Disconnect the electrical connector and fuel lines using the disconnect tool. Use a screwdriver to pry off the locking ring (or use a lock ring tool). Lift the entire assembly out of the tank. Drain any remaining fuel into a container.
  5. Disassemble the Stock Pump: On a clean workbench, remove the strainer, disconnect the wiring, and slide the pump out of the mounting bracket. Note the orientation of the rubber isolator.
  6. Install the DeatschWerks Pump: Place the new pump into the bracket, ensuring the outlet aligns with the hanger. Reinstall the isolator and connect the wiring harness (the DW pump uses the same connector — no splicing required). Attach the new strainer supplied in the kit.
  7. Reassemble and Test: Lower the assembly back into the tank, replace the locking ring, reconnect fuel lines and electrical connector. Reinstall the access plate, seats, battery, and fuel pump fuse. Turn the key to ON (without starting) three times to prime the system. Check for leaks.
  8. Start and Verify: Start the engine and let it idle. Monitor fuel pressure with a gauge or scan tool. The DeatschWerks pump should maintain a steady 43–48 PSI at idle and hold within 1–2 PSI under load.

Total installation time for a first-timer is about 2–3 hours. The only tricky part is releasing the quick-disconnect fuel fittings — a plastic tool is highly recommended to avoid damaging the clips.

Performance Improvements: Before and After Data

I had my car dyno-tuned both before and after the fuel pump upgrade to quantify the gains. The car was already running with a cold air intake, high-flow cats, and a Z1 34-row oil cooler. The tune was optimized for 93 octane pump gas. Here are the measurable results:

Fuel Pressure Logging

  • Stock Pump: At 6,200 RPM, fuel pressure dropped from 48 PSI to 42 PSI. Air-fuel ratios leaned out from 12.5:1 to 13.2:1 — dangerously lean for sustained operation.
  • DeatschWerks 250lph Pump: Fuel pressure remained at a solid 48 PSI all the way to 7,800 RPM. AFRs stayed locked at 12.3:1 across the entire pull.

Dyno Results

  • Before Pump Upgrade: 340 whp / 290 lb-ft torque (on a Dyno Dynamics)
  • After Pump Upgrade (same tune): 348 whp / 294 lb-ft torque — a small gain from improved fuel delivery alone.
  • After Pump Upgrade + Retune: 365 whp / 305 lb-ft torque — the tuner was able to advance timing and lean the mixture slightly, safely unlocking additional power that the stock pump could not support.

The 25-wheel horsepower gain from the retune is significant, but the real story is consistency. On hot summer days, the car now pulls identically from run to run. The stock pump would suffer from heat soak and pressure fade after three consecutive pulls; the DW pump does not flinch.

Real-World Driving Experience

Beyond the numbers on a dyno sheet, the DeatschWerks pump transformed how the 370Z feels on the road and track.

Throttle Response

The most immediate change I noticed was sharper throttle tip-in. The car no longer hesitates when I stab the gas from a low RPM. This is especially noticeable when exiting tight corners — the engine picks up instantly, eliminating the lag that plagued the stock fuel system.

High-RPM Pull

Above 6,000 RPM, the VQ37VHR used to feel like it was “running out of breath.” With the DW pump, it pulls hard all the way to the 7,500 RPM fuel cut. The engine note even sounds smoother — likely because the injectors are receiving a consistent spray pattern instead of fluctuating pressure.

Cold Starts and Daily Driving

I was initially worried that a high-flow pump would be noisy or cause rich idle flooding. However, the DeatschWerks unit is virtually silent inside the cabin (the foam wrap does its job). Cold starts are crisp, and the fuel trims stay within 5% of zero once the engine reaches operating temperature. There is no negative impact on fuel economy either — if anything, the efficient fuel delivery might have improved my highway mileage by about 1 MPG.

Potential Downsides and Considerations

No modification is perfect, and the DeatschWerks 250lph pump has a few points worth noting:

  • Not a Direct Drop-In for All 370Z Years: The pump fits all years, but the wiring harness connector changed slightly after 2012. DeatschWerks includes adapters, but check your specific model year to be sure.
  • Returnless Fuel System: The 370Z uses a returnless system with a pressure regulator in the fuel pump module. The DW pump is compatible, but if you plan to go with a return-style system (common on high-horsepower builds), you will need additional components like an external regulator.
  • Ethanol Drawbacks: While the pump handles E85, E85 is incredibly corrosive to rubber and fuel hangers over time. DeatschWerks uses E85-compatible materials, but you should still inspect your fuel lines and tank sock annually if running ethanol.
  • Heat Generation: Turbine pumps are more efficient, but any high-flow pump adds heat to the fuel. In extremely hot climates, you may want to consider a fuel cooler kit to maintain consistent density and avoid vapor lock.

Comparison: DeatschWerks vs. Other Options

The aftermarket offers several alternative pumps for the 370Z, including Walbro 255, AEM 320, and DW 400. Here’s how the DW 250lph stacks up:

Pump Flow @ 43 PSI Noise Level Direct Fit E85 Safe
Stock ~180-200 lph Silent Yes No
Walbro 255 255 lph Moderate whine Requires wiring mod Yes, but older seals may degrade
DeatschWerks 250 250 lph Very quiet Complete plug-and-play Yes, fully compatible
AEM 320 320 lph Noticeable whine Requires adapters Yes

For most 370Z owners who are not chasing extreme power levels (600+ whp), the DeatschWerks 250lph provides the perfect balance of flow, silence, and ease of installation. If you plan on exceeding 550 wheel horsepower, consider the DW400 or a dual-pump setup, but for stage 1 and stage 2 builds, the 250lph is ideal.

Conclusion: A Worthwhile Upgrade for Any Enthusiast

Installing the DeatschWerks 250lph fuel pump in my Nissan 370Z was a straightforward modification that delivered measurable gains in power, consistency, and drivability. It eliminated the fuel pressure drop that was holding back my bolt-on engine, and it gave my tuner the headroom needed to optimize the calibration safely. Whether you are building a naturally aspirated track car, a street-driven E85 toy, or a force-induced monster, this pump is a reliable foundation for your fuel system.

The cost — roughly $150–$180 — is minimal compared to the engine damage that can result from a lean condition. Two years and 20,000 miles later, my DW pump continues to perform flawlessly, with no loss in flow or mechanical issues. I highly recommend it to any 370Z owner looking to unlock the full potential of their build without breaking the bank.

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