Engineered for 2004.5–2018 Dodge Ram 2500 and 3500 diesel trucks powered by the 5.9L Common Rail or 6.7L 24V Cummins engine, the PureFlow AirDog II-5G DF-100 System (A7SPBD254) provides modern air/fuel separation tailored for daily drivers, work trucks, and mild street builds. Factory in-tank fuel transfer pumps often experience pressure drop under acceleration or heavy towing loads, pulling line vacuum that entrains damaging air and vapor bubbles into the diesel charge. This air disruption distorts injector spray patterns, induces injector plunger galling, and triggers P0087 and P1093 low fuel rail pressure trouble codes; the AirDog II-5G eliminates supply drop by providing steady, purified positive feed pressure directly to the high-pressure injection pump.

The 5G platform integrates a diaphragm-style fuel pressure regulator mechanically adjustable from 7 to 55 PSI (factory preset to 15–17 PSI) for steady delivery with optional boost compensation capability. Fuel is pulled through an included Fuel Module Upgrade Kit that installs into the factory tank module using a 1/2-inch bulkhead fitting, completely bypassing the restrictive stock in-tank pump. An upgraded 12-gauge wiring harness with sealed Metri-Pack 280 connectors delivers reliable current without excess heat to power a quiet 4-bearing motor with an intermediate shaft. Operating with AirDog’s Demand Flow deaeration circuit, the system purges entrained air, vapor, and moisture down to 2 microns absolute while recirculating unconsumed fuel directly through the filter base.

Key Features & Benefits

• Consistent 100 GPH Fuel Delivery: Supplies an uninterrupted 100 gallons per hour of pure diesel fuel to eliminate P0087 / P1093 low rail pressure codes and support stock to mild street setups up to 500 HP.
• Integrated Diaphragm Pressure Regulator: Mechanically adjustable from 7 to 55 PSI (preset to 15–17 PSI) to dial in exact injection pump inlet pressure; supports optional boost compensation.
• Demand Flow Fuel Recirculation: Recirculates unconsumed filtered fuel directly through the filter base rather than continually dumping aerated, heated fuel back into the tank.
• In-Tank Fuel Module Upgrade Kit: Includes an in-tank suction tube and 1/2-inch bulkhead fitting to bypass the factory pump; returns air and vapor through the original 3/8-inch factory suction line without cutting the filler neck.
• Upgraded 12-Gauge Metri-Pack Harness: Heavy 12-gauge wiring harness paired with a sealed Metri-Pack 280 connector prevents terminal heating and ensures maximum voltage delivery.
• Dual-Stage 2-Micron Filtration: Combines an external spin-on water separator (WS100) and a 2-micron particulate filter (FF100-2) to shield CP3 pumps and common rail injectors from moisture and fine abrasives.
• Self-Aligning Intermediate Shaft Motor: Dampens motor noise, centers the gerotor gear set, and reduces mechanical drag for quiet, long-term chassis operation.

Technical Specifications

• Manufacturer Part Number / SKU: A7SPBD254 (DF-100-5G Series)
• Truck Platform: 2004.5–2009 (3rd Gen) & 2010–2018 (4th Gen) Ram Heavy Duty 2500 / 3500
• Engine Platform: 2004.5–2007 5.9L Common Rail & 2007.5–2018 6.7L 24V Cummins Turbo Diesel
• Flow Rating: 100 Gallons Per Hour (GPH)
• Operating Pressure: Mechanically Adjustable from 7 to 55 PSI (Preset to 15–17 PSI)
• Pressure Regulator Type: Integrated Diaphragm Regulator with Boost Compensation Port
• Horsepower Rating: Recommended for Stock to 500 HP Applications
• Filtration Rating: 2-Micron Particulate Filter (FF100-2) & High-Efficiency Water Separator (WS100)
• Suction Hardware: Fuel Module Upgrade Kit (1/2" Bulkhead Assembly)
• Electrical System: 12-Gauge Relay Harness with Metri-Pack 280 and Weather Pack Connectors
• Mounting System: Drill-Free Frame Sandwich Plate Brackets
• Warranty: PureFlow AirDog Limited Lifetime Warranty (with completed product registration)

Vehicle Fitment & Installation Notes

• 2004.5–2007 Dodge Ram 2500 / 3500 – 5.9L 24V Common Rail Cummins (Engine Codes "ETH" 325 HP)
• 2007.5–2009 Dodge Ram 2500 / 3500 – 6.7L 24V Cummins Turbo Diesel
• 2010–2018 Ram 2500 / 3500 – 6.7L 24V Cummins Turbo Diesel
• Fits Model Years: 2004.5, 2005, 2006, 2007, 2007.5, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
• Fitment Notice: Engineered for trucks with the in-tank lift pump setup. Early 2004 and older 5.9L trucks equipped with factory engine-mounted canister pumps require kit A7SABD525 or specific draw straw routing. Does not fit 2019+ Ram chassis platforms.
• Installation Tip: Install the Fuel Module Upgrade Kit into the factory fuel basket following the template to ensure the 1/2" suction tube sits 1/4" off the bottom; connect the AirDog air/vapor return line directly to the factory 3/8" suction line fitting on top of the module to eliminate the need for an external filler-neck splice.