The purpose of any diesel fuel filter is to remove foreign particles as well as water. The use of a
suitable filtration system on diesel engines is a must to avoid damage to
closely fitted injection pump and injector components. Filter's ability
varies between the type and manufacturer. On diesel engines primary and
secondary filters are used. The primary filter is capable of removing dirt
particles down to 30 microns and the secondary filter between 10 to 12 microns.
Secondary filters are available between 3 and 5 microns, which are used in
severe service operations. The primary filter is usually located between the
tank and the supply pump, the FWS is one type of the primary filters. The
secondary filter between the supply pump and the injection pump.
Diesel fuel filter is
referred to as full-flow filter, because all the fuel must pass through it
before reaching the injection pump. Some filters use internal replaceable
element inside a bowl or shell. These are commonly referred to as a shell and
element design. Most fuel filters used today are of the spin-on type, which
allow for faster change out since the complete filter is a throwaway.
Besides, if the filter is
installed on the pressure side of the boost pump it must have sufficient
strength to handle pump pressure without bursting or leaking. The filter must
be located well away from sources of heat, preferably outside of the engine
compartment.
Components
The fuel filter of diesel
engine is mainly composed of three parts: filter element, the shell and filter
base. All models are universal except for the overflow
valve 8 that has two structures. Choosing C0810A or C0810B filter should be on
the basis of different models. For the 12 cylinder V type diesel genset, it
should be installed in parallel with each one of C0810A and C0810B.
The fuel is sent to the fuel
filter mainly by the fuel pump. The impurities in the fuel will be cleared
through the paper filter element. And then the fuel can enter the inner cavity
of the filter cylinder. Through the collection chamber of the filter sea, it
leads to the fuel injection pump. The filter holder is equipped with fuel
return fitting and the overflow valve is also installed inside. When the fuel
pressure in the fuel filter is more than 78kPa(0.8kgf/C㎡),
the excess fuel will return back to the fuel tank from the fuel return fitting.
When connecting the low pressure fuel line, you should connect it according to
the arrow pointing direction on the socket to avoid connection error. The
filter seat and the shell are connected by pull rod, and it is sealed by rubber
ring. Due to there is a bleeder plug on the top of filter seat, users can
release the screw to clear the air of the fuel filter in use.
The fuel filter of the
diesel engine is fixed on the engine body and bracket with two M8-6H screws. If
users find that the fuel supply is not smooth, it is possible that the filter
element is plugged. At the moment, you should dump the fuel oil. You can directly
loosen the pull rod nut of diesel generator set, remove the shell, and take out
the filter cartridge. After the filter element is dipped
into gasoline or diesel oil, you can gently wash the dirt off with brush. If the filter cartridge is broken or hard to clean, it must
be renewed. Then install it as shown in Figure 1 and inject the clean fuel.
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