K&N Inline Electric Fuel Pump (81-0402)

The K&N 81-0402 is a robust, universal inline electric fuel pump engineered to deliver a consistent fuel supply for a wide range of carbureted applications, from vintage street vehicles to small-scale race engines. It acts as a reliable, self-regulating replacement for mechanical fuel pumps, effectively eliminating common issues like hot-weather vapor lock and cold-start flooding.

Key Specifications

• Part Number: 81-0402
• Flow Rate: 121 Liters per Hour (32 Gallons per Hour)
• Operating Pressure: 4–7 PSI (Self-Regulating)
• Compatibility: Gasoline, Diesel, Biodiesel, E85, Methanol, Ethanol, and Alcohol
• Design Type: External / Inline
• Inlet/Outlet: 5/16" Hose Barb
• Voltage: 12V DC system
• Filtration: Includes required 74-micron in-line fuel filter

Product Overview & Performance

Built with a solid-state internal design, the 81-0402 is noted for its compact footprint and quiet operation compared to traditional performance pumps. Being a self-priming unit, it offers ease of installation for various mounting locations along the fuel line. It is specifically tuned to operate within the 4–7 PSI range, making it ideal for standard carburetors that require consistent pressure without the need for an external regulator.

Usage & Application Notes

• Versatility: Suitable for modern fuel systems and specialized racing setups due to its broad fuel compatibility.
• Application: Ideal for V8 street cruisers, classic cars, and performance engines.
• Safety Tip: For optimal longevity, mount the pump within 12 inches (vertically) of the fuel tank. Integration with an oil pressure safety switch is recommended to ensure the pump cuts off automatically if the engine stalls.

K&N Inline Fuel Pump Series

View other available fuel pump options:

• K&N Inline Fuel Pump (81-0400) - 57LPH, 1–2 PSI
• K&N Inline Fuel Pump (81-0401) - 95LPH, 1.5–4 PSI
• K&N Inline Fuel Pump (81-0402) - 121LPH, 4–7 PSI
• K&N Inline Diesel Fuel Pump (81-0403) - 129LPH, 7–10 PSI