Fuel Supply & Leak Off - Beta Marine Beta 50 Operator's Maintenance Manual

FUEL SUPPLY & LEAK OFF
17 Fuel Supply and Leak Off
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.
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, please refer to image 17. This prevents
fuel 'drain down'.
FUEL & COOLING CONNECTIONS
Engine Connector
Fuel supply and leak-off connections are 8 mm conex with olives
Flexible Fuel
Connections
to be used
Fuel/water
separator
5. Fuel lines and hoses connecting the fuel tank to the
6. Any fuel leaks in the system when static are likely to
16
Engine (All Fuel Connections Supplied)
Fuel injectors
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, marine grade flexible fuel
hoses are highly recommended.
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.
Hose O.D
8 mm O.D
Fuel injection
pump
Fuel filter
Fuel lift pump