PureFlow AirDog A4SPBD101 FP-100-4G Fuel Air Separation System 1998.5-2004 Dodge Cummins

The PureFlow AirDog FP-100-4G (A4SPBD101) is a complete fuel air separation and lift pump system engineered for 1998.5–2004 Dodge Ram trucks equipped with the 5.9L Cummins diesel engine. Designed for trucks without an in-tank fuel pump, this system delivers clean, air-free, vapor-free fuel directly to the injection pump — improving combustion efficiency, throttle response, and injector longevity.

The AirDog FP-100-4G uses a patented multi-stage filtration and air separation process to remove entrained air, water, and contaminants from the fuel supply before it ever reaches the high-pressure injection system. This is especially critical on the 24-valve Cummins, where air and vapor in the fuel line can cause hard starts, rough idle, power loss, and premature injector failure.

Key Features:

• 100 GPH fuel flow capacity for stock to mildly modified Cummins applications
• Patented air and vapor separation technology removes entrained air before it reaches injectors
• Integrated water separator removes moisture from the fuel supply
• Maintains consistent fuel pressure to the injection pump for improved performance and reliability
• Designed for 1998.5–2004 Dodge Ram 2500/3500 with 5.9L Cummins without an OEM in-tank fuel pump
• 4G (4th Generation) design with updated filtration media and housing
• Direct-fit, vehicle-specific mounting for clean installation
• Reusable and serviceable filter elements

The AirDog FP-100-4G is a popular upgrade for diesel truck owners looking to protect their fuel system investment, extend injector and injection pump life, and restore or improve fuel delivery performance. The system includes the lift pump assembly, mounting hardware, and necessary fittings for installation.