DeatschWerks DW420 Fuel Pump for 1992-2006 BMW E36 / E46 - 9-421-1031

DeatschWerks | DW420 | 420 LPH Fuel Pump | BMW E36 / E46 | 325i | 328i | 330i | M3 | In-Tank | E85 Compatible | High-Flow Performance

Give your BMW the fuel delivery your performance build demands with the DeatschWerks DW420 420 LPH In-Tank Fuel Pump, part number 9-421-1031. Designed for select 1992-2006 BMW E36 and E46 applications, including the 325i, 328i, 330i, and M3, this high-output electric fuel pump delivers 420 liters per hour at 43.5 PSI and 13.5V. Its quiet turbine-style impeller, ethanol-compatible construction, and high-pressure-focused flow design make it an excellent option for properly configured turbocharged, supercharged, and high-horsepower BMW builds. Complete with a vehicle-specific installation kit, wiring harness, and mounting hardware, the DW420 offers serious fuel delivery capacity in a factory-style in-tank configuration.

Key Features & Specifications:

• Brand: DeatschWerks

• Series: DW420

• Part Number: 9-421-1031

• Product Type: High-Flow Performance Fuel Pump

• Fuel Pump Type: Electric In-Tank

• Flow Rate: 420 LPH (Approximately 111 GPH)

• Rated Flow Pressure: 43.5 PSI

• Rated Test Voltage: 13.5V

• Pump Technology: Composite Turbine Impeller

• Flow Characteristics: Engineered for Strong Fuel Delivery at Higher Pressures

• Fuel Compatibility: Gasoline and Ethanol Fuels, Including E85

• Pump Driver Compatibility: Pulse-Width-Modulated (PWM) Systems

• Armature: Fully Encapsulated and Computer-Balanced

• Commutators / Brushes: Carbon

• Vehicle Platforms: BMW E36 / E46

• Fuel Pump Inlet Size: 11.00mm

• Inlet Connection: Factory-Style

• Fuel Pump Outlet Size: 5/16 Inch

• Outlet Connection: Hose Barb

• Inlet / Outlet Quantity: 1 Each

• Installation Kit: BMW-Specific Kit Included

• Wiring Harness Included: Yes

• Mounting Hardware Included: Yes

• Fuel Pressure Regulator Included: No

• Sending Unit Included: No

• Mounting Bracket Included: No

• Gasket Included: No

• Recommended Wiring Upgrade: 10-Gauge Hardwire Kit

• Recommended Hardwire Kit: DeatschWerks FPHWK-10-HD, Sold Separately

• Quantity: 1 Fuel Pump with Installation Components

• UPC: 00887753542519

Kit Includes:

• 1 x DeatschWerks DW420 420 LPH In-Tank Electric Fuel Pump

• 1 x BMW-Specific Fuel Pump Installation Kit

• Electrical Wiring Harness Components

• Mounting Hardware

A separate hardwire upgrade kit, replacement sending unit, fuel pressure regulator, and mounting bracket are not included.

About the DeatschWerks DW420 Fuel Pump

Take your BMW fuel system beyond the limitations of a conventional replacement pump with the DeatschWerks DW420. Designed for high-flow applications, the DW420 delivers 420 LPH at its specified test conditions while maintaining a relatively flat flow curve as operating pressure increases.

Its composite turbine impeller provides quiet operation and supports compatibility with pulse-width-modulated fuel pump control systems. DeatschWerks also uses carbon commutators and a fully encapsulated armature to help protect internal electrical components from ethanol exposure.

The pump's armature is computer-balanced to reduce vibration, while its high-pressure-focused design makes it suitable for demanding performance builds.

DeatschWerks subjects its pump designs to extensive endurance testing, including 1,000 hours of bench testing in multiple fuels, followed by real-world vehicle evaluation. Individual pumps are also flow-tested before packaging.

For E36 and E46 enthusiasts building a modified street car, track-focused M3, or high-output forced-induction setup, the DW420 offers substantial fuel delivery capacity with application-specific installation components.

Fitment & Installation Notes:

• 1992-1995 BMW 325i: E36

• 1992-1995 BMW 325is: E36

• 1996-2000 BMW 328i: E36 / E46, Depending on Model Year

• 1996-1999 BMW 328is: E36

• 2000 BMW 328Ci: E46

• 2001-2005 BMW 330i: E46

• 2001-2005 BMW 330xi: E46

• 2001-2006 BMW 330Ci: E46

• 1995-1999 BMW M3: E36, Including 1995 Lightweight

• 2001-2006 BMW M3: E46

• Installation Location: Compatible factory in-tank fuel pump assembly.

• Installation Kit: BMW-specific installation components included.

• Wiring & Hardware: Wiring harness and mounting hardware included with this configuration.

• Electrical Recommendation: DeatschWerks strongly recommends a 10-gauge hardwire kit for optimum pump voltage.

• Recommended Hardwire Kit: FPHWK-10-HD, sold separately.

• Fuel Delivery: Rated 420 LPH at 43.5 PSI and 13.5V. Actual flow varies with operating pressure and supplied voltage.

• Fuel System Matching: Confirm injector capacity, fuel pressure regulation, electrical load, and factory pump module compatibility before installation.

The DeatschWerks DW420 9-421-1031 combines high-capacity fuel delivery, E85 compatibility, and BMW-specific installation components for compatible E36 and E46 performance applications.