Air is necessary for successful combustion in your engine. In fact, for efficient combustion, a modern diesel engine requires several thousand times as much air as it does fuel. Clean air – air almost 100% pure – is critical to engine survival and vital to its performance.

If you add a turbocharger to your engine, you may need to make changes to the intake ducting. Turbocharged engines require even more free-flowing clean air, 750 cubic feet per minute or more. Naturally aspirated engines demand about 20% less, but still these engines can require up to 15,000 gallons of air for every gallon of fuel. In either case the induction system (ducting, hoses, and reducers) brings outside air to the engine.

Many existing fuel filters aren’t designed to remove significant amounts of water. They are designed to do their job in a single step. This means they must be porous enough to allow sufficient flow volume, which limits filtering ability. Any tighter media would result in frequent element changes.

The DAHL system takes care of those shortcomings. DAHL’s functional dual-chamber 3-stage diesel fuel filter/water separators provide efficient suction side water separation and contaminant filtration. The key is the unique DAHL patented depressurizer cone, which spreads the flow of the fuel. With more area to flow over, greater separation of water and dirt from the fuel is achieved.

DAHL fuel filter/water separators have less mechanical flow resistance than other separators, because the fuel changes direction only twice. The DAHL unit removes virtually 100% of the water and most of the contaminants from the fuel.