
- Water Separation: Fuel passes through a water separator, which removes all water and large particulate contaminants.
- Fuel Pump: The fuel then reaches the pump, which pressurizes it for the next stage.
- Filtration: Under positive pressure, the fuel flows through a filter that traps any remaining minute particles.
- Air/Vapor Removal: Simultaneously, any entrained air and vapor are separated from the fuel and returned to the tank.
- 150 GPH Fuel Pump: Provides the robust fuel flow required for highly modified engines.
- Eliminates Air & Water From Fuel: Protects your injectors and other fuel system components from long-term damage.
- Increases Overall Engine Efficiency: Leads to a faster throttle response and optimized engine performance.
- Reliable 4G Motor Design: This proven motor ensures a long-lasting, cost-effective solution.
- Lifetime Limited Warranty: AirDog stands behind this product with a comprehensive limited lifetime warranty for complete peace of mind.
- Complete Kit: Comes with all the necessary plumbing, hardware, wiring, and mounting brackets for a straightforward installation.

If you have a moderately to extremely modified 2015-2016 GM 6.6L Duramax LML, the stock fuel system is a major bottleneck. The AirDog A4SPBC191 FP-150-4G Air/Fuel Separation System is the perfect solution. Higher fuel flows in modified engines can introduce damaging air and vapor into your system. This not only hurts performance but can also permanently damage your expensive injectors through galling, pitting, and tip erosion. The AirDog system actively removes these contaminants, ensuring your engine gets the clean, consistent fuel supply it needs to perform at its best while protecting its most vital components.
How It Works
The AirDog functions as a complete lift pump and filtration system, pulling fuel from your tank and putting it through a multi-stage process:
Water Separation: Fuel passes through a water separator, which removes all water and large particulate contaminants.
Fuel Pump: The fuel then reaches the pump, which pressurizes it for the next stage.
Filtration: Under positive pressure, the fuel flows through a filter that traps any remaining minute particles.
Air/Vapor Removal: Simultaneously, any e[...]
- Water Separation: Fuel passes through a water separator, which removes all water and large particulate contaminants.
- Fuel Pump: The fuel then reaches the pump, which pressurizes it for the next stage.
- Filtration: Under positive pressure, the fuel flows through a filter that traps any remaining minute particles.
- Air/Vapor Removal: Simultaneously, any entrained air and vapor are separated from the fuel and returned to the tank.
- 150 GPH Fuel Pump: Provides the robust fuel flow required for highly modified engines.
- Eliminates Air & Water From Fuel: Protects your injectors and other fuel system components from long-term damage.
- Increases Overall Engine Efficiency: Leads to a faster throttle response and optimized engine performance.
- Reliable 4G Motor Design: This proven motor ensures a long-lasting, cost-effective solution.
- Lifetime Limited Warranty: AirDog stands behind this product with a comprehensive limited lifetime warranty for complete peace of mind.
- Complete Kit: Comes with all the necessary plumbing, hardware, wiring, and mounting brackets for a straightforward installation.