This is my first blog entry for our ongoing projects in Diesel Fuel Systems & Hydraulics.
This week we removed, disassembled,
and inspected a DAVCO 380 fuel filter/water separator from an FLD
Freightliner. This particular system does not use a primary/secondary
filter, but instead uses a single filter/water separator in the low
pressure (suction) side of the transfer pump. Fuel in/fuel out ports
are clearly marked, and the “fuel in” fitting is equipped with a
spring-loaded check ball valve. It is mounted to the frame with a
bracket near the driver's side firewall by two u-bolts and is easily
accessible.
Some thoughts on what I learned:
One question asked during class was if
this fuel filter/water separator included a heater. As per service information, I learned
that these fuel filters come with an optional fuel heater, which uses
engine coolant to heat the fuel and a thermal control valve to
regulate fuel temperature. When equipped, the filter housing will
have coolant in/coolant out ports and electrical connections. Ours did not.
Basic maintenance is straight-forward and
simply involves the replacement of the filter element and old seals.
A special tool is used to remove and reinstall the top vent cap (which aids in
draining) and the filter cover from the housing.
Overall a good introduction to some basic components of the fuel system on a commercial diesel truck. Of course, during this project the lessons of organization, bagging and tagging components, and the use of service information is always reinforced.
I have included a few pictures below.
-Erik Miehrig
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| Filter housing and clear cover. |
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| Spring-loaded check ball valve for "fuel in." |
