Services Connection To The Engine Compartment; Services Connection Points; Fuel Circuit - FNM HPE Series Installation Manual

5 Services connection to the engine compartment

5.1 Services connection points

The marine engines of the FNM® HPE range are provided of
yellow tags that indicate the connection points of the various
circuits of the engine to the devices and to the services of the
boat.
The tags also indicate particular situations of danger as well as
useful information to the installer, such as the absence of oil or
coolant in the engine.
After installing the engine remove all the tags that signal the
circuits.

5.2 Fuel circuit

When installing the fuel circuit, always respect the
laws in the country where the boat will be used, as
well as the rules of common sense necessary to
prevent the occurrence of accidents.
The fuel circuit must ensure safety and be equipped with a
control system that promptly alerts the boat driver of loss or
faults.
Use diesel fuel complying with the EN590
specifications. The use of fuels with different formula
may irreparably damage the engine.
5.2.1 Tank
The tank is a component that is not supplied with the engine
that requires accurate procedures and maintenance. Always
refer to the manufacturer's instructions.
Follow the instructions below for connecting the tank (Figure):
All connections must be positioned on the upper side of
-
the tank.
The drain plug must be in the lowest point of the tank and
-
allow the emptying of residues and sediment.
The diameter of the fill tube (or refilling) must be equal to
-
or greater than 50 mm (2 in).
The vent pipe of the tank must have a minimum internal
-
diameter of 13 mm (1/2 in) and prevent the entry of water
in the tank.
Breather
Delivery
(suction)
Tank
Fuel filter
At the low pressure pump (on the engine)
Figure 20 - Tank configuration
All fuel pipes must be securely fastened with cable gland. The
holes through which the pipes enter in bulkheads must be
rounded and protected with rubber seals to prevent abrasion
and the consequent tubes breakage.
NOT ACCEPTABLE
Figure 21 - Diesel return pipe position
Pay attention to the connection of the diesel fuel return pipe.
The return pipe must end in the highest part possible of the
tank (as shown in Figure 21).
The fuel must be extracted from at least 25 mm (1 in) in height
from the bottom of the tank to prevent suction of impurities.
The delivery (suction) and return pipes of the diesel fuel must
have a minimum internal diameter of 8 mm (5/16 in). The
outlet is connected to the fuel filter before reaching the low
pressure pump.
FNM® Series HPE – Installation Manual – 21
Topping up
Return
Return from
engine
ACCEPTABLE