Volvo D11 series, Installation Manual

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Fuel system
70
Fuel return line dimensions
Piping
All fuel lines should be led and properly clamped
near bottom of the boat to avoid heat radiation.
NOTE! The D5 and D7 has a high fuel flow and
therefor must the fuel lines have a large diameter. To
small piping will reduce the power output.
Rubber hoses
The figures show the most common types of con-
nections for fuel pipes. Make sure to use the correct
dimension of approved flexible hose.
3
2
The tank must be properly vented. The tank venting
line () should have an inner diameter of minimum 2
mm (/2"). Raise the hose internally to create a water
lock.
The filler fitting (2) should be adapted for a minimum
50 mm (2.0") hose connection. The hose between the
deck fitting and the tank must overlap the tubing at
either end with at least 75 mm (3.0") and be locked
with two hose clamps. The hose clamps must be
made of a corrosion-resistant material.
Common ground for the fuel tank, filling etc. is not
generally necessary
for diesel installations. Local
authorities, however, could demand this on boats in
general.
NOTE! Install the filler and venting hoses, preventing
traps (3) being formed.
NOTE! The fuel filler fitting and venting must be in-
stalled in a way that prevents overfilling and fuel en-
tering air intakes.
Inner
∅
From tank to fuel line connection point
NOTE! Classification Societies and some registra-
tion bodies (i.e. river authorities) do not permit rubber
hoses for fuel lines, or require hoses to conform to
certain specifications. Check if the boat is to be used
in these areas.
Clamp the fuel line. Distance between clamps should
be approx. 300 mm (2").
All engines 0 mm (3/8") 0 mm (3/8")
<6 m (20') >6 m (20')
D5/D7 2 mm (/2") 4 mm
D9/D/D2/D6 0 mm (3/8") 0 mm (38")