7.10.4 FUEL FILTER AND PRESSURE REGULATOR
In addition to the finger screen in the tank outlet, the fuel feed from the fuel
pumps enters a filter, also called Gascolator, which filters dusts and sediments
as well as water that may have accumulated in the tanks.
The fuel tanks and Gascolator drains shall be checked for water accumulation
during each pre-flight inspection.
Fuel is then routed to the engine fuel pressure regulator mounted on the engine,
where after it splits into two separate branches, one for each carburettor. A fuel
pressure sensor is connected in parallel of the fuel pipe branches.
Fuel return lines return excess fuel supplied by the fuel pump(s) to the fuel tank
in use. In normal operation, a pump will deliver 120 L / hour to the regulator, the
engine will use 25 L / hour and about 95 L / hour will return to the fuel tank.
NOTE
Fuel pumps are equipped with an integrated fine filter. In case of refueling
with fuel containing microscopic fibers or dust (invisible to human), dirt will
accumulate in fine filters until they become clogged. This will result in pumps
being unable to supply enough fuel to the engine.
Always use the funnel with integrated fine filter when refueling the aircraft.
In case of suspicion of filter clogged, check Fuel Flow on EMS.
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