Installation Instructions

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Airdog has done it again with a true industry first! The all-new Airdog II-5G is the first fuel air separation system made with an integrated diaphragm fuel pressure regulator. You can easily adjust the regulator from a range of 7 to 70 psi, and boost can be compensated as well. Many other features carry over from the groundbreaking II-4G kits. The II-5G fuel pumps are similarly built with a four-bearing design with an intermediate shaft. This reduces pump noise for a super-quiet ride, and increases pump longevity and reliability. The Low Flow Return reduces aeration in your fuel tank. The Demand Flow feature enables the pump to only send the fuel the engine needs. And like II-4G, these new II-5G kits come with a Dual Feed that feeds fuel to both sides of the Gerotor Pump to decrease cavitation. The II-5G product line includes higher-flowing pumps and comes with larger ports. They use 3/416 O-ring boss (-8) inlet and outlet ports and a 7/16-20 return port (-4). This gives you more options for fuel line sizing if needed.


Key Features

  • This Is A Complete Kit – Includes Pump & All Needed Mounting Hardware
  • 4 Bearing Motor with Intermediate Shaft For Reduced Pump Noise
  • Larger Ports Over Previous Pumps
  • Diaphragm Fuel Pressure Regulator
  • Demand Flow Design
  • Adjustable From 7-70 PSI
  • Increased Fuel Economy
  • Increased Horsepower & Torque Output
  • Increased Injection Pump Life
  • Longer Injector Life
  • Improved Throttle Response
  • Reduced Exhaust Emissions
  • Increased Fuel Flow Rates
  • Removes Air/Vapor from Diesel Fuel
  • Complete Installation Kit and Detailed Instructions
  • 1/2" Fuel Lines with OEM-Style Quick Connect Fittings
  • Lifetime Warranty


The AirDog II-5G offers protection and performance like no other lift pump! Our patented air separation, along with a water separator and fuel filter makes sure your expensive injection system components get all the clean fuel they need. The AirDog® II-5G also overcomes loss of power due to driving in higher altitudes with a factory fuel pump. The AirDog II-5G System Improves Engine Performance by eliminating spray pattern disruption due to air entering the system. This allows the engine to keep its designed injection timing which allows a more complete burn of the fuel entering the cylinder. This increases overall engine efficiency across the power and torque range!


This product can expose you to chemicals which are known to the State of California to cause cancer. For more information go to
California Proposition 65 Notice
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