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Bleeding the system is not always needed following filter replacement, as in many cases there will be enough fuel remaining in the system to start the engine and purge the lines.
A clogged filter will reduce transfer pump supply pressure and could starve unit injectors of fuel. This results in cavitation erosion that damages injector plungers increasing plunger-bore clearances.
Transfer pump pressure should be tested periodically. Insuffucient supply pressure slows fuel flow through the injector body, even before the restriction affects engine performance adversely.
By 2006, the sulfur content in diesel fuel is mandated to drop from its current allowable maximum rate of 500 parts per million (ppm) to 15 ppm. The use of low-sulfur diesel fuel coupled with advanced vehicle control technologies is recommended to reduce both particulate matter and nitrous oxide.
Water should be drained from the fuel tanks and fuel/water seprator filters regularly, ideally after a vehicle sits overnight and peior to refueling. Clean motor oil, not diesel fuel, should be used to lubricate WIX Heavy Duty fuel filters before installation.
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