Usa models are equipped with an additional system with an evaporative emissions canister that prevents fuel fumes from being discharged into the atmosphere.
The breather hose (4) is connected to the canister filter (1); when the fuel has been filtered, it is returned through the hose (2) to the horizontal (a) and vertical (b) intake manifolds via the hoses (2a) and (2b). Drainage pipe (c) and the hose (5) vent to the ground.
For correct positioning of the connection hoses consult the indications given below.

Evaporative emissions canister
Removal of the evaporative emissions canisterReassembly of the cylinder head
The exhaust side can be identified by the three threaded holes on the flange.
The intake side can be identified by the presence of four threaded holes on
the flange.
All the photos in this chapter refer to a vertical cylinder head.
Valve guide sealing rings
Position the cylinder head o ...
Refitting the shock absorber support
If you had removed them, apply recommended grease on the threads of the
adjusters (4) and the ring nuts (3) having
care not to have grease on the surface (c) of the adjusters.
Tighten the adjusters on the ring nut side opposite to that featuring flats
until bringing the surfaces as close as ...
Injectors
Introduction
The injectors used on the diavel are top feed units, meaning that fuel is fed
into the top of the injector itself. The
injectors contain a winding which raises a needle when electrically energised.
This opens the atomiser nozzle, through
which pressurised fuel is dispensed, gener ...