LW15473 - Lycoming OEM Dual Diaphram High Pressure Fuel Pump

LW15473 – Lycoming OEM Dual Diaphragm High-Pressure Fuel Pump

Available now on the Airparts.aero Marketplace.

Overview

The Lycoming LW15473 is a genuine OEM, engine-driven, dual diaphragm fuel pump engineered for high-performance, fuel-injected Lycoming engines. This mechanical pump is a flight-critical component that ensures a constant and reliable supply of high-pressure fuel to the fuel injection system under all operating conditions. Its hallmark feature is the dual-diaphragm design, an integrated safety system that provides an essential layer of protection against fuel/oil contamination. Manufactured to Lycoming's exact material and performance specifications, the LW15473 is the factory-certified standard for ensuring the reliability and safety of your aircraft's fuel delivery system.

Key Features

• Dual-Diaphragm Safety: Features two independent diaphragms separated by an air chamber. Should the primary fuel-side diaphragm rupture, fuel is safely captured and discharged through an overboard vent line, preventing it from contaminating the engine oil in the crankcase.
• High-Pressure Output: Specifically designed for fuel-injected engines, this pump delivers a consistent fuel pressure in the range of 25-30 PSI, ensuring the fuel injection servo receives adequate pressure for proper fuel metering and engine performance.
• Engine-Driven Reliability: Actuated mechanically by a dedicated lobe on the engine's camshaft, it provides a robust and reliable fuel supply that is independent of the aircraft's electrical system, forming the core of the primary fuel system.
• Durable Channel Arm Design: Utilizes a strong, single-piece cast channel-style actuating arm for maximum durability and resistance to wear, representing an improvement over older, laminated arm designs.
• Genuine Lycoming OEM Part: As a genuine factory part, it guarantees perfect fitment, correct pressure delivery, and adherence to the stringent quality control and material standards required for FAA Type Certified engines.

Technical Specifications

• Part Number: LW15473
• Component Type: Engine-Driven, Dual Diaphragm Fuel Pump
• Pressure Rating: High Pressure (25 - 30 PSI)
• Actuation Method: Mechanical Camshaft Lobe
• Safety Feature: Vent port for overboard leak indication
• Application: Fuel Injected Lycoming Engines
• Certification: FAA Production Approval

Aircraft Compatibility

The Lycoming LW15473 is the specified high-pressure fuel pump for a wide array of aircraft equipped with fuel-injected Lycoming engines. Its application spans numerous high-performance single and multi-engine aircraft. It is imperative to consult the specific aircraft and engine Illustrated Parts Catalog (IPC) for final verification.

• Common Engine Series:
  • IO-320, LIO-320
  • IO-360, LIO-360
  • IO-540, TIO-540
• Common Aircraft Models:
  • Piper Arrow, Seneca, Navajo, Lance
  • Mooney M20F, M20J
  • Beechcraft Sierra, Super III
  • Cessna 177RG

Notes

SUPERSEDES TO 62B26931 VENDOR DIRECTIVE REFERENCE SEB96-16 REFERENCE SB01-73-01, SEB01-5, SEB05-1

Applications

The LW15473 is the heart of the primary fuel delivery system for fuel-injected engines:

• Primary Fuel Delivery: Its main function is to draw fuel from the tanks and deliver it under high pressure to the fuel control unit/servo.
• Engine Overhaul: A critical component that is typically replaced or overhauled during any major engine overhaul to ensure system reliability.
• Fuel System Troubleshooting: The primary component to inspect when diagnosing issues of low or fluctuating fuel pressure during engine operation (with the electric boost pump off).

Why Choose LW15473?

The integrity of the fuel delivery system is paramount to flight safety. The Lycoming LW15473 pump's dual-diaphragm design is a critical safety feature that provides a clear indication of an impending failure while preventing catastrophic engine damage from fuel-oil mixing. Using a genuine Lycoming OEM pump ensures that you are installing a component with the correct, factory-set pressure relief values, the proper materials to resist modern aviation fuels, and the robust construction needed to endure millions of pressure cycles. For a component this vital, there is no substitute for the guaranteed performance and airworthiness of a genuine Lycoming part.

Order Your LW15473 Fuel Pump Now

Ensure the safety and reliability of your fuel-injected engine with a genuine Lycoming fuel pump. Visit Airparts.aero to order your LW15473 today.

The Lycoming LW15473 fuel pump operates via a lever arm that rides on an eccentric lobe of the engine's camshaft. As the camshaft rotates, the lever pivots, pulling the dual-diaphragm assembly down against spring pressure. This downward stroke creates a vacuum in the fuel chamber, drawing fuel in from the tank through a one-way inlet valve. As the cam lobe continues to rotate past its highest point, the spring pressure pushes the diaphragms upward. This upward stroke pressurizes the trapped fuel, forcing it out through a one-way outlet valve to the fuel injector servo. The dual-diaphragm system provides a redundant seal between the fuel chamber and the engine's oil-lubricated interior. A failure of the first diaphragm allows fuel to enter the intermediate chamber and drain harmlessly overboard through the vent line, providing an immediate visual indication of a fault during pre-flight inspection.

Note: Installation of this component must be performed by a certified A&P mechanic in accordance with the current Lycoming Overhaul and Maintenance Manuals. Proper installation requires careful alignment of the actuating arm with the pushrod in the accessory case. Always use a new gasket upon installation.

Requires Lycoming Gasket 60096

Textron Replacement Part Number - 62B26931