RNLI Atlantic 85, Manual

Page: 81 / 122

Activity 9 - Propulsion and Auxiliary Systems
81
B Class Atlantic 85 Manual – First Issue, June 2017
Activity 9 - Propulsion and Auxiliary Systems
Intake
Silencer
Intake Air
Pressure Sensor
Intake Manifold
Air Ventilation
Pressure Regulator
Fuel
Rail
Exhaust
Vapour
Separator
Float Filter
High
Pressure
Fuel
Pump
Fuel
Tank
Low
Pressure
Fuel
Pump
Fuel
Filter
Fuel
Cooler
Fuel
Injector
Filter
Engine fuel system
The fuel is drawn up from the on-board fuel system
(see page 93), through the fuel filter which contains
a water separator and water detection switch. The
mechanical lift pump (low pressure pump) continues to
send the fuel into the vapour separator which contains a
float and a high pressure fuel pump.
The high pressure fuel pump sends the fuel to the fuel rail
where a pressure regulator maintains a stable fuel pressure
according to the vacuum pressure in the intake manifold.
With a maintained fuel pressure, the ECU can control the
precise quantity of fuel to be injected into the cylinders,
depending on the signals received from the other parts of
the electronic control system.
Excess fuel goes back into the separator via a fuel cooler
that uses the cooling system to condense the fuel; brass
pipes are used to prevent corrosion.