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AirDog FPII Heavy Duty Diesel Fuel System Give your engine a serious strength boost and a longer service life with an AirDog Heavy Duty Fuel System. Get the performance that you and your big rig deserve with AirDog’s Fuel Systems! The AirDog is designed to operate at flows and pressures beyond the maximum requirements of a diesel engine removing entrained air and vapor and particulate contaminants thereby restoring optimal running conditions to the engine. The patented AirDog is the only fuel air separation system with third party verified positive air separation.