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1. The mechanical fuel lift pump is fitted to all engines as standard, but if a suction head of 0.25m is
required then an electric fuel lift pump must be fitted (ask your dealer or Beta Marine).
2. It is very important that the excess fuel from the injectors is fed back to the fuel tank and not back to
any point on the supply line. This will help prevent air getting into the system.
3. Fuel pipe sizes are:
Supply (mm)
Leak off (mm)
8
8
4. Any fuel leaks in the system are likely to cause poor starting and erratic running and must be
corrected immediately.
5. A fuel/water separator must be installed. (See 7).
6. 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 12. This prevents fuel 'drain down'. This can cause poor starting. (See 12).
7. Fuel lines and hoses must be secured and separated or protected from any source of significant heat.
The filling, storage, venting and fuel supply arrangements and installations must be designed and
installed so as to minimise the risk of fire and explosion. Flexible fuel hoses connecting the engine to
fuel tank supply and return lines must meet the requirements set in standard ISO 7840:1995/A1:2000
and as required by your surveyor / authority.
SEAWATER INLET SYSTEM (Heat exchanger cooled engines)
Your engine is fitted with a gear driven sea water pump which sucks in seawater or raw water to cool the
closed circuit system via the heat exchanger.
1. It is very important that the seawater inlet should
have a strainer system either built into the sea cock or a
high level system with visual inspection glass, as
shown, mounted just above the water line.
2. The inlet sea cock and pipe work to the sea water
pump should be 25mm ID or 1" minimum.
3. Good access to the inlet sea cock is essential so that
plastic bags or seaweed trapped in the intake can be
poked out!
4. All pipe work should have approved marine grade
stainless steel hose clips. Any loose clamps or bad
connections can cause flooding and sinking the vessel.
5. If water is required for stern tube lubrication then this should be taken from a 'T' piece in the pipe
going from the heat exchanger outlet to the water injection bend.
6. Scoop type water pickups should never be used, as water will be forced through the pump and into
the exhaust system whilst the vessel is in motion. This is very dangerous as the exhaust will eventually
fill and raw water will back up into the engine through the exhaust valve. Catastrophic failure will result
as soon as the engine is restarted.
Note: The maximum lift of the sea water pump is 2m
25
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