PureFlow AirDog A4SPBC189 FP-150-4G Fuel Air Separation System

The PureFlow AirDog FP-150-4G (A4SPBC189) is a high-performance fuel air separation system designed for the 2011–2014 Chevrolet/GMC Duramax diesel engine. The AirDog FP-150-4G removes entrained air, vapor, and contaminants from diesel fuel before it reaches the injection system, helping protect sensitive high-pressure common rail injectors and fuel pumps from premature wear.

This system flows 150 gallons per hour (GPH), making it well-suited for both stock and moderately modified Duramax applications. The fourth-generation design incorporates an improved fuel pump motor and updated filtration architecture for enhanced reliability and service life compared to previous generations.

Key Features:

• 150 GPH flow rate — supports stock through performance-modified Duramax engines
• Air and vapor separation — removes entrained air before fuel reaches the CP4 high-pressure fuel pump
• Multi-stage filtration — separates water and particulate contaminants from the fuel supply
• 4th Generation (4G) design — updated pump motor and filtration system for improved durability
• Helps protect high-pressure fuel injection components from air-induced cavitation damage
• Pre-filter and fuel/water separator included in the system
• Designed for direct OEM-style installation on 2011–2014 Duramax diesel trucks

The AirDog FP-150-4G fuel air separation system is a proven solution for Duramax owners looking to extend injector and CP4 pump life, improve fuel system reliability, and maintain consistent fuel delivery under all operating conditions.