Workshop Manual

REG. CODE
1-5302-509
MODEL N°
50778
DATE OF ISSUE
10.06.99
REVISION 00
DATE
10.06.99
ENDORSED
COMPILER TECO/ATI
50
XI
FUELLING CIRCUIT
Do not smoke or use naked flames during the disassembly
and reassembly operations as this could lead to explosions or
fire outbreaks.
Fuel vapours are highly toxic. Only carry out these operations
outdoors or in a well ventilated place.
Keep your face well away from the cap to avoid inhaling
harmful vapours.
Fuelling circuit
Components:
1 Tank 6 Pipes from fuel pump to carburetor
2 Fuel filter 7 Drain tube from fuel pump to tank
3 Fuel pump
4 Carburetors
5 Tube from tank to fuel filter
Note: The tank complete with filter is supplied on request.
Never ever fit the fuel filter near heat sources or naked flames
(e.g. silencers, exhaust connection pipes, etc.).
Periodically check the condition of the fuel pipes.
Fuel filter detached from tank
The fuel filter for the engines in question is the Lombardini type
serial N° 3730.106.
You are advised to use genuine spare parts since their 350 cm³
filtering area volume and their filtering degree have been specially
researched.
It is advisable to replace the fuel filter after every 350 hours service
in normal operating conditions.
When replacing, check the arrow that indicates the correct mounting
direction, see fig. 125.
Fuel pump
Components:
1 Fuel pump casing
2 Rod
3 Retention ring
4 Fuel inlet from tank
5 Fuel outlet from fuel pump to carburetor
6 Fuel pump return to tank
The fuel pump is the diaphragm type and is operated by an
eccentric of the camshaft by means of a rod.
The eccentric should be tightened to a 80 Nm torque.
Specifications:
At 2000 r/min of the eccentric, the flow rate is 40 l/h and the self-
regulating pressure 0.3 ±0-05 bar.
Fuel pump rod projection
Projection A of rod 2 from the head surface is 0.85 to 1.35 mm.
Inspections must be made with eccentric 1 in the non-operative
position as shown in figure 127.
Lock the two fuel pump fixing nuts to a 24 Nm torque.
Check the length of the rod and change it if it is not the right size.
Rod length = 85.45 ±0.5 mm.
127
124
126
125