18
Fuel tank
Stop tap / valve
Fuel / water
separator
Fuel filter
Fuel lift pump
Fuel injection
pump
Engine (All Fuel Connections Supplied)
Flexible Fuel
Connections
to be used
Fuel injectors
Vent
FUEL SUPPLY & LEAK OFF
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’.
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.
25 Fuel Supply and Leak Off
ENGINE CONNECTIONS
Actual Connector: Required Pipe Size:
Fuel supply and leak-off = 8 mm conex with olives 8 mm OD piping for both, a flexible section is required
Seawater cooling pump = 22 mm OD Seawater pump inlet = 22 mm ID hose
Exhaust water injection bend = 50 mm OD Flexible rubber exhaust pipe of correct quality = 50 mm ID
1640_Aug_2013.qxd:beta 1660 manual 18/11/13 10:48 Page 18
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