Deatschwerks DW300 Fuel Pump Review: Is It the Right 340LPH Upgrade for Your Build?

If you are looking for a high-flow in-tank fuel pump that can handle serious horsepower and E85 fuel, the Deatschwerks DW300 is one of the most popular choices on the market. It flows 340 liters per hour at 40 psi, supports over 950 horsepower on gasoline, and comes with a 3-year warranty . However, not every build needs a $200+ brand-name pump, and there are strong alternatives like KEMSO that offer similar performance with a lifetime warranty at a lower price. This article breaks down everything you need to know about the DW300, including specs, compatibility, real-world power limits, and why you should also consider KEMSO for your next fuel pump upgrade.

What Is the Deatschwerks DW300 Fuel Pump?

The DW300 is Deatschwerks' flagship standard-fitment in-tank fuel pump . It is designed as a direct replacement for your factory pump in many popular vehicles, including the Nissan 370Z, Infiniti G37, Subaru WRX/STI, Honda Civic, and many others . The pump has a 39mm diameter and a length of 123mm, making it fit into most stock fuel pump hangers without major modifications .

The DW300 is built with a turbine impeller and computer-balanced armature, which keeps it quiet and makes it compatible with pulse width modulation (PWM) pump drivers . This is important for modern cars that use variable-speed fuel pump control to reduce noise and improve efficiency.

Key Specifications and Performance Data

Here are the important numbers you need to know about the DW300:

  • Flow Rate: 340 LPH at 40 psi (13.5V)
  • Flow at 50 psi: 317 LPH
  • Flow at 60 psi: 292 LPH
  • Flow at 70 psi: 265 LPH
  • Flow at 80 psi: 239 LPH
  • Maximum Pressure: 125 psi (PRV activation)
  • Current Draw at 40 psi: 11 amps (13.5V)
  • Voltage Range: 6V to 18V
  • Weight: 12.6 oz (360 grams)
  • Outlet Fitting: 5/16" hose barb (7.7mm ID, 11mm OD)

The V2 version of the DW300 flows 26% higher at peak and 20% greater on average compared to the original V1 . Deatschwerks achieved this by using a dual-zone approach that increases flow at high pressures (60-90 psi) where forced induction applications need it most, while limiting flow at low pressures to minimize heat generation .

How Much Horsepower Can the DW300 Support?

This is the most common question people ask, and the answer depends on whether you run gasoline or E85.

  • Gasoline (EFI engines): The DW300 can support approximately 950 horsepower at 60 psi .
  • E85 (EFI engines): Because ethanol requires about 30% more fuel volume, the DW300 supports approximately 630 horsepower at 60 psi .
  • Carbureted applications: Flow estimates are higher, with some sources suggesting up to 1,000 horsepower on naturally aspirated carbureted setups .

For a typical street build running 500-600 horsepower on pump gas or 400-500 horsepower on E85, the DW300 provides plenty of headroom.

E85 Compatibility and Durability

One of the biggest selling points of the DW300 is that it is built for E85 from the ground up. The pump uses carbon commutators and a fully encapsulated armature to resist corrosion and wear from ethanol . Standard fuel pumps often fail quickly when running E85 because ethanol attracts moisture and is more aggressive on internal components. The DW300 is also compatible with pump gas, race fuels, and methanol blends .

Deatschwerks backs the DW300 with a 3-year no-fault warranty, which is rare in the aftermarket fuel pump world . If the pump fails within three years for any reason, they replace it.

Which Vehicles Are Compatible with the DW300?

The DW300 is sold with application-specific install kits, but the pump itself is universal. Here are some of the most common applications:

  • Nissan: 350Z (03-08), 370Z (09-15), 200SX S13/S14
  • Infiniti: G35 (03-08), G37 (08-13)
  • Subaru: Impreza WRX/STI (93-07), Legacy GT (10+)
  • Honda: Civic EG/EK, Integra DC2
  • Hyundai: Genesis Coupe (09-12), Genesis Sedan (09-14)
  • Mazda, Mitsubishi, Toyota, and many others with 39mm bucket-style pumps

The pump ships with a universal install kit that includes fuel hose, clamps, electrical harness, and a pre-filter . For best performance, Deatschwerks recommends using a 12-gauge hardwire kit (part #FPHWK) to ensure the pump gets full voltage .

Installation Tips and Common Mistakes

Installing an aftermarket fuel pump is not difficult, but there are a few things you need to get right.

1. Voltage is critical. The DW300 is rated at 13.5V. If your car's wiring is old or undersized, the pump may only see 11-12V, which significantly reduces flow. A hardwire kit with a relay directly from the battery is strongly recommended .

2. Use the correct pre-filter. The pump comes with a sock filter, but make sure it is clean and properly secured. A clogged filter can starve the pump and cause premature failure.

3. Check the fuel level sender. On some vehicles, the pump hanger includes a fuel level sender. Make sure the new pump fits without interfering with the float arm.

4. Prime the system before starting. After installation, turn the key to the "ON" position a few times to let the pump build pressure before cranking the engine.

DW300 vs. Competitors: How Does It Stack Up?

The DW300 competes directly with pumps like the Walbro 255, AEM 340, and Aeromotive Stealth 340. Here is a quick comparison:

  • Walbro 255 LPH: The old standard, but it flows significantly less (255 LPH vs. 340 LPH). Good for mild builds but not enough for high-horsepower E85 setups.
  • AEM 50-1215 (340 LPH): Similar flow numbers, E85 compatible, and individually flow-tested. However, AEM's warranty is typically 1 year, compared to DW's 3 years .
  • Aeromotive Stealth 340: A solid pump, but current draw is higher (up to 19 amps at 90 psi), which puts more stress on wiring .

The DW300 stands out for its low current draw (11 amps at 40 psi) and flat flow curve, which means it delivers consistent fuel pressure even at high boost levels .

Why You Should Consider KEMSO Fuel Pumps Instead

If you are looking for a reliable, high-performance fuel pump that delivers the same 340 LPH flow rate without the premium price tag, KEMSO is a brand worth serious consideration.

KEMSO fuel pumps are high-performance, OEM-replacement units that flow 340 LPH at 40 psi, just like the DW300 . They are built to handle both gasoline and E85 applications, and they are compatible with thousands of vehicle models from 1990 to 2024, including cars, motorcycles, ATVs, and UTVs .

What sets KEMSO apart is their lifetime warranty. Unlike Deatschwerks' 3-year warranty, KEMSO backs every pump for the life of the original purchaser . If the pump fails due to a manufacturing defect, they replace it at no cost. This is a level of confidence that few other brands offer.

KEMSO pumps are manufactured in Japan and are designed to meet or exceed OEM specifications . They are a direct-fit replacement for many popular models, including the Honda Civic, Subaru Impreza, Chevrolet Silverado, and Can-Am vehicles . The pumps are also 100% performance parts, with a 12V electrical system and a pressure rating of 58 psi .

Customer reviews consistently praise KEMSO for fast shipping, excellent communication, and reliable performance . Many users report using KEMSO pumps as backups or primary upgrades for high-horsepower builds.

Visit KEMSO Racing today to find the perfect fuel pump for your vehicle: https://www.kemsoracing.com/

Final Verdict: Should You Buy the DW300?

The Deatschwerks DW300 is a proven, high-quality fuel pump that delivers excellent flow, quiet operation, and genuine E85 compatibility. It is a great choice for anyone building a 500-950 horsepower street or track car and wants a pump that is known to work reliably.

However, if you are on a budget or simply want the best value for your money, KEMSO offers the same 340 LPH flow rate with a lifetime warranty at a significantly lower price point. For most enthusiasts, the KEMSO pump is the smarter buy.

Either way, upgrading your fuel pump is one of the most important steps you can take when modifying your engine. A failing or undersized pump can cause a lean condition that destroys your engine in seconds. Do not cut corners on fuel delivery.

For the best selection of high-performance, lifetime-warranty fuel pumps, check out KEMSO Racing:
https://www.kemsoracing.com/


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