Effective filtration of even tiny water droplets
MANN-FILTER is presenting new diesel fuel filters with three-stage water separation for the independent aftermarket at the Automechanika show this year. The innovative filters achieve consistently high water separation efficiency of over 90 percent, making them one of the technical highlights of the MANN-FILTER product range.
Even high-quality diesel may contain traces of water, be it from moist air entering through the tank opening or from condensation in the large tanks used to store the diesel in gas stations. However, advanced common rail diesel injection systems with pressures of up to 2,500 bar have higher requirements than simple mechanical systems in terms of the purity of the fuel. Tiny dirt particles as well as water drops can damage the components of the fuel circuit, which could even result in system failure. Another challenge is the composition of modern diesel fuels with very little sulphur and high amounts of biofuel and additives, thereby resulting in the formation of very small and stable water drops in the diesel fuel and hence requires a new water separation technology.
The innovative PU 9005 z and PU 10 011 z diesel fuel filters from MANN-FILTER are designed in three stages for the challenging job of removing these very small and finely distributed water droplets from the diesel fuel. In the first stage, the filter medium reliably removes solid dirt particles from the diesel fuel. The second filter stage uses a coalescer fleece. It retains even the finest water droplets from the fuel/water emulsion and combines them to form much larger drops. In the third stage, a hydrophobic sieve ensures that the enlarged drops do not enter the injection system. Gravity causes the separated water to collect in a water collection chamber in the filter module. A sensor signals as soon as the water needs to be manually drained or siphoned. Metal-free elements mean that both filters are completely incinerable and therefore can be recycled to protect the environment.
Easy-to-service concept
The PU 10 011 z is equipped with a handle so the filter can easily be replaced in the workshop. A screw integrated in the housing cover also ensures easy water removal from above during servicing.
International filtration expert MANN+HUMMEL is already mass producing the highly efficient diesel fuel filters for several automobile manufacturers.
Excellent performance across the entire service interval
With the three-stage water separators, car workshops and wholesalers are offering their customers a new filter element which achieves extremely high efficiency over its entire service life. It separates more than 93 percent of the water in fuel when new, and its separation efficiency is still over 90 percent at the end of the service interval. The benefit for the vehicle owner is therefore clear: “Whether corrosion or cavitation effects in injectors, valves, or the electric injection pump, this innovative separation technology from MANN-FILTER greatly reduces damage that can result in system failure,” says Lena Ketschau, Product Manager Fuel Filters in MANN+HUMMEL’s Automotive Aftermarket business unit. Reliable performance is very important if the vehicle is used in countries where the fuel has high water content.