Can type filters are usually applied as fine filters and coares filters in multistage filtration systems, and there are often filters used with characteristic drain plugs inside the separator.

Water generally does not dissolve in fuel, but remains as drops or emulsion causing corrosion process intensification of metal parts in fuel system.

Water is removed from fuel using sedimentation effect (gravitation drops settling in decanters) and coalescence - water drops separation in fuel flow through filter medium.

These filters are designed similarly as can type oil filters, however, they do not have any inner valves. The filter replacement process is also similar and means
only unscrewing the used filter and tightening the new
one.

Also as in the case of spin-on oil filters, used filters
disposal is expensive and this model is widely replaced
by ECO cartidges.

In-jection filters are applied in fuel systems, especially in petrol carburettor en-gines and fuel injection engines, installed on the fuel pipe using quick connect fittings or band clips.

These filters have a filtering cartridge with paper medium, which is pleated or warped. Warped cartridges are made of special, thin filtering material.

It has a highly filtration efficiency but limited absorptivity; hence the filtering medium surface for these filters must be larger than for filters with pleated medium.