Fuel Supply And "Leak Off; Engine Connections - Beta Marine Beta 43 Operator's Maintenance Manual

Fuel supply & leak off
7
Vent
Fuel tank
Stop tap/valve
Notes:
1) A fuel/water separator must be installed.
2) The mechanical fuel lift pump is fitted to all engines as
standard, but if a suction head of 0.25m or more is
required, then an electric fuel lift pump must be fitted
(ask your dealer or Beta Marine).
3) It is very important that the excess fuel from the injectors
is fed back to the fuel tank and not back to any point in
the supply line. This will help prevent air getting into the
system.
4) The fuel return (leak off) pipe must loop down to be level
with the bottom of the tank before it enters the top of the
tank – see drawing. This prevents fuel 'drain down'.

Engine Connections

Actual Connector:
Fuel supply and fuel leaf-off connections are 8 mm conex with olives
Seawater cooling pump connections are 28 mm OD
Water injected exhaust elbow outlet 50 mm OD
Flexible Fuel
Connections
to be used
Fuel/water
separator
5) Fuel lines and hoses connecting the fuel tank to the
engine, must be secured, separated and protected from
any source of significant heat. The filling, storage,
venting, fuel supply arrangements and installation must
be designed and installed so as to minimise the risk of
fire. When connecting the engine to the fuel supply and
return lines, flexible fuel hoses must be used (next to the
engine) and must meet the requirements set in standard
ISO7840:1995/A1:2000 and/or as required by your
surveyor / authority.
6) Any fuel leaks in the system when static are likely to
cause poor starting and erratic running and must be
corrected immediately. These leaks will allow air to be
sucked in when the engine is running.
8
Engine (All Fuel Connections Supplied)
Fuel injectors
Fuel injection
pump
Fuel filter
Fuel lift pump
Required Pipe Size:
8 mm O.D piping for both with flexible section
Engine Inlet = 28 mm I.D hose
Flexible exhaust rubber pipe to correct quality
- 50 mm OD