The AirDog II 4G 100GPH A6SPBC258 lift pump, or Fuel Preporator, by Pureflow Technologies is a must have upgrade for your 1992-2000 6.5L GM diesel. The fuel system on your GM diesel is the heart of the vehicle’s performance and reliability. This low pressure (8-10 psi) 6.5L lift pump mounts to the inner frame rail using the supplied sandwich plate mounting system. The suction/fuel supply sides hook directly up to the factory quick disconnect fittings on the tank. The pressure side line connects direct to the factory feed line to the injection pump on the frame, bypassing the frame mounted factory pump.  This makes the install very straight forward.


The AirDog II 4G 100GPH 6.5L lift pump will solve the infamous P0087 & P1093 low fuel rail pressure codes. This positive supply being fed to your injection pump will also add performance, throttle response, and longevity to your vehicle. Due to extra stress on your fuel system from either high mileage and/or additional performance modifications, like a tuner or larger injectors, your injection pump can become weak over time. This may result in a drop of performance, reliability, and fuel economy. The supplied water separator (WS100) and fuel filter (FF100-2), that mount to the pump, filter your fuel down to a 2 micron rating, which surpasses the stock fuel filters filtration capability. (see How It Works)


This AirDog II 4G 100GPH 6.5L lift pump is recommended for trucks that have a stock to a mildly upgraded fuel system (meaning mild or stock injectors, injection pump, and tuning). Backed by a lifetime warranty. (See How To Choose A Lift Pump)


Benefits of the 4G Fuel System
  • Improved Throttle Response
  • Longer Injection System Life
  • Increased Power and Torque
  • Reduced Exhaust Emissions
  • Higher than Stock Flow Rates in Some Models
  • Adjustable Fuel Pressure Regulator
  • Quiet and Smooth Pump Operation

Unlike many competitors and older AirDog products, the 4G offers features to make it more durable than any other brushed DC motor system on the market!

AirDog ® II-4G Installation for Any Skill Level

The installation of any AirDog/Raptor system has been designed with the customer in mind. We know not everyone has special tools or fabrication skills, so the installation was made as easy as possible with basic hand tools and the, occasional, power drill. The quick-connect fittings and fuel lines make this a true plug and go installation, reducing the overall installation time. The step-by-step manual outlines each process of the installation and is accompanied by visual guides to aid your progress.

All-Inclusive Installation Kit Includes:

  • Relay Control Wiring Harness
  • All required Fuel Fittings
  • 1/2″ Fuel Line
  • Mounting Brackets and Hardware
  • Installation Manual

Additional information

Weight 27 lbs
Dimensions 19 × 13 × 7 in


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