K&N Inline Diesel & High-Flow Fuel Pump (81-0403)

The K&N 81-0403 is the highest-output pump in this series, engineered to tackle demanding environments and diesel systems. With a 129LPH flow rate and a 7–10 PSI operating range, this unit is built for applications requiring significant fuel volume and pressure, ensuring your engine receives optimal flow under load.

Key Specifications

• Part Number: 81-0403 | Flow Rate: 129LPH (34 GPH) | Pressure: 7–10 PSI
• Compatibility: Gasoline, Diesel, Biodiesel, E85, Methanol, Ethanol, Alcohol

Overview

Whether you are running a diesel application or a highly modified performance engine, the 81-0403 provides the heavy-duty performance you need. It retains the same universal inline design and broad fuel compatibility as the rest of the K&N range, making it a powerful, reliable upgrade for specialized setups.

Usage Notes

• Application: Best for high-demand diesel applications and performance race builds.
• Safety: Always ensure your fuel system pressure regulator (if used) is compatible with 7–10 PSI input.

K&N Inline Fuel Pump Series

• 81-0400 - 57LPH, 1–2 PSI (Vintage)
• 81-0401 - 95LPH, 1.5–4 PSI (Street Performance)
• 81-0402 - 121LPH, 4–7 PSI (High-Performance Carbureted)
• 81-0403 - 129LPH, 7–10 PSI (High-Flow / Diesel)