DeatschWerks DW320 320 LPH In-Tank Fuel Pump – 1989–1993 Mazda Miata NA | Complete Setup Kit

The DeatschWerks DW320 320 LPH In-Tank Fuel Pump with 1989–1993 Mazda Miata NA setup kit is a complete, direct-fit high-flow fuel pump solution for the NA Miata — delivering 320 litres per hour of fuel flow capacity to support high-power engine builds, forced induction conversions, and other fuel system upgrades that exceed the factory fuel pump's flow capability. DeatschWerks is one of the most respected fuel system brands in the performance aftermarket — known for their high-flow in-tank pumps, injectors, and fuel system components engineered for correct fitment and reliable performance in demanding applications. The DW320 is a proven high-flow pump that has supported a wide range of performance builds across multiple platforms, and the Miata-specific setup kit ensures correct installation in the NA Miata's fuel tank without modification. A complete fuel pump upgrade solution for NA Miata owners who have outgrown the factory pump's flow capacity.

Key Features:

• 320 LPH flow rate — 320 litres per hour of fuel flow capacity at low pressure — significantly higher than the factory NA Miata fuel pump — supports high-power naturally aspirated, turbocharged, and supercharged builds
• Complete setup kit — includes the DW320 pump and all required components for correct installation in the 1989–1993 Mazda Miata NA fuel tank — no additional sourcing required for a complete installation
• Direct-fit for NA Miata — the Miata-specific setup kit provides correct fitment for the NA Miata's fuel tank and pump assembly — no modification required
• In-tank design — in-tank fuel pump installation maintains the factory fuel system layout — quieter operation and better fuel cooling than external inline pump alternatives
• DeatschWerks quality — manufactured by DeatschWerks, a respected US fuel system brand with over 800 SKUs covering sport compact, muscle, euro, and powersport applications

When Do You Need a 320 LPH Fuel Pump on the NA Miata?

• Factory Pump Limitation: The factory NA Miata fuel pump is sized for the stock 1.6L or 1.8L naturally aspirated engine's fuel requirements — adequate for stock power levels but insufficient for builds that significantly increase fuel demand. Forced induction (turbo or supercharger), high-compression naturally aspirated builds, and E85 conversions all increase fuel demand beyond what the factory pump can reliably supply. A fuel pump that cannot keep up with demand causes fuel pressure drop under load — lean conditions that can cause detonation and engine damage.
• Turbo & Supercharger Builds: Forced induction dramatically increases fuel demand — a turbocharged NA Miata making 200+ whp requires significantly more fuel flow than the factory pump provides. The DW320's 320 LPH capacity provides substantial headroom for forced induction builds, supporting power levels well beyond what most NA Miata builds target.
• E85 Conversion: E85 ethanol fuel requires approximately 30–40% more fuel volume than gasoline to achieve the same air-fuel ratio — a factory-sized pump that was marginal on gasoline will be significantly undersized on E85. The DW320's high flow capacity provides the additional volume required for E85 operation.
• High-RPM Naturally Aspirated Builds: High-revving naturally aspirated NA Miata builds with aggressive camshafts, high-compression pistons, and individual throttle bodies can also exceed the factory pump's flow capacity at high RPM — particularly when combined with larger injectors that require higher fuel pressure to operate correctly.

Specifications:

• Brand: DeatschWerks
• Part Number: 9-301-0836
• Barcode: 9-301-0836
• Pump Model: DW320
• Flow Rate: 320 LPH (at low pressure)
• Type: In-tank fuel pump
• Application: 1989–1993 Mazda Miata NA — complete setup kit
• Weight: 1.2 lbs

Fitment Information:

• 1989–1993 Mazda Miata NA (first generation)
• Complete setup kit specific to the 1989–1993 NA Miata fuel tank and pump assembly — verify fitment for your specific NA Miata model year before ordering
• Note: Not compatible with the NB Miata (1999–2005) or later generations without a different setup kit. Verify that your NA Miata's fuel system has not been previously modified in a way that affects pump fitment before ordering.

What's Included:

• DeatschWerks DW320 320 LPH in-tank fuel pump
• 1989–1993 Mazda Miata NA setup kit — all required components for correct installation in the NA Miata fuel tank
• Refer to DeatschWerks' product documentation for complete kit contents

Installation Notes:

• Professional installation recommended — in-tank fuel pump replacement requires correct fuel system depressurization, correct pump assembly procedure, and correct electrical connection
• Depressurize the fuel system before beginning installation — the NA Miata's fuel system retains pressure after engine shutdown. Follow the correct depressurization procedure before opening any fuel system connections.
• Work in a well-ventilated area away from ignition sources — fuel vapour is highly flammable. Do not smoke or use open flames near the fuel tank during installation.
• Replace the fuel pump strainer/sock during installation — a new high-flow pump installed with a clogged or restricted strainer will not achieve its rated flow capacity
• Verify correct electrical connection polarity before starting the engine — incorrect polarity will damage the pump motor
• Prime the fuel system before starting the engine after installation — cycle the ignition key to the ON position several times without cranking to allow the pump to pressurize the fuel system before the first start
• Check for fuel leaks at all connections after installation and after the first heat cycle

Why DeatschWerks?

DeatschWerks is a US fuel system brand based in Oklahoma City, OK — known for their high-flow in-tank fuel pumps, injectors, fuel rails, surge tanks, and fuel system accessories for sport compact, muscle, euro, and powersport applications. DeatschWerks established their reputation in 2004 with high-flow drop-in fuel injectors and expanded into fuel pumps in 2009 with the DW300 — the highest-flowing in-tank pump of its time. Today, DeatschWerks' lineup covers over 800 SKUs with a focus on correct fitment, reliable performance, and genuine flow capacity that supports the power levels their customers are building. For NA Miata owners who want a proven, correctly-fitted high-flow fuel pump from a brand that understands fuel system engineering, DeatschWerks is the correct choice.

Perfect For:

• 1989–1993 Mazda Miata NA owners with turbocharged or supercharged builds that have exceeded the factory fuel pump's flow capacity
• NA Miata E85 conversions where the factory pump's flow capacity is insufficient for the increased fuel volume that E85 requires
• High-revving naturally aspirated NA Miata builds with larger injectors and aggressive engine modifications that demand higher fuel flow
• Owners completing a comprehensive NA Miata fuel system upgrade — pairing the DW320 pump with larger injectors and a fuel pressure regulator for a complete high-flow fuel system

Safety Note: Fuel system work involves flammable fuel and vapour — depressurize the fuel system before beginning, work in a well-ventilated area away from ignition sources, and check for leaks after installation. Professional installation recommended.