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Fuel Filtration

Overview
FUEL FILTRATION Filter Media

Filtration media represents the central point of any filter design. Mastering this science is a key focus at
Donaldson. While our users may not need to share this same level of understanding, some basics are
always helpful. With the media representations below, we hope to educate our customers on some of the
more commonly used media types in this ever-changing industry.

Today’s engines are built to more stringent specifications and finer tolerances. Fuel systems, pumps and
injectors require cleaner fuel to achieve better combustion and lower emissions. That’s why the latest
advances in filter media can make the difference between engine power and engine problems.

Cellulose (traditional media)
Engine fuel filter media is How it Works SEM 100x SEM 600x
most commonly a pleated
cellulose base material. This
fuel filter media is tested for
compatibility with a variety
of diesel fuels, including
biodiesel and ULSD.
Larger particulate
are trapped on
outer layer, while
finer particles are
held deeper in
the media. Media Image

Treated Cellulose (Fuel Filter Water Separator Media)
This fuel filter water separator How it Works SEM 100x SEM 600x
media is a cellulose base
material. Treating a cellulose
media with a silicon based
treatment allows for effective
water separation. Typically, this
media is used on the suction
side of the fuel system to
remove harmful water and
coarse particulate contaminant.
Water coalesces
on media and
drains to bottom Media Image
of can/bowl.
Particulate is
trapped and held in media.

26 • Engine Liquid Filtration www.donaldson.com