Vittorazi Motors MOSTER 185 EFI Installation Manual page 37

The fuel contained inside the fuel tank (1) is filtered by the Vittorazi paper filter (2), flows through
the catch tube (3), the Vittorazi pass-through (4) and the FBU supply pipe (8), enters into the FBU
(9) passes inside the fuel pump (10), flows through the microfilter (11) and is sent on the injector
supply tube (12) to the injector (13).
From the injector (13) there is a return line (14) where the fuel goes back into the FBU (9),
encounters the pressure sensor (15), the electrovalve (16) and is sent back into the fuel tank (1)
through the FBU return pipe (17).
On the fuel tank (1) there is a vent pipe (22) with a brass porex filter (23) at its end.
During normal engine operation the electrovalve (16) remains closed, therefore, the injector
return line (14) is a static pressurized line. The electrovalve (16) is only opened during the fuel line
filling in order to allow the fuel to circulate and remove any air bubbles and in case of overpressure
due to fast throttle release.
Moster 185 EFI - Installation manual – V1/2024 37