Nanni V6.270 - Fuel System; Bleeding the Fuel Circuit; Replacing the Fuel Fi Lter

Maintenance
18
Fuel system
I
Danger! : Total cleanliness must be guaranteed when working on the fuel circuit. No impurities must enter the injection
pump and the injectors. Carry out each of these operations with the engine cold and stopped.
A
B
C
Bleeding the fuel circuit
The fuel circuit is self-priming but manual bleeding is required
after replacing the fi lter, after have running out of fuel or after
a work on the circuit if it has been emptied.
• Untighten the drain valve screw A on the engine fuel
fi lter support.
• Pump the priming pump by pressing the button B
repeatedly until bubble-free fuel comes out of the drain
valve screw.
• Tighten the drain valve screw and lock the hand pump B.
I Attention! : Avoid draining all the fuel in the fi lter when
bleeding. If you have, remove the fi lter and replenish with fuel
before replacing it and repeat the bleeding.
Replacing the fuel fi lter
This fi lter treats the water and impurities in the fuel before it
enters the injection circuit.
• Cut the fuel intake at the tank.
• Place a receptacle under the fi lter and then remove the
used fi lter C cartridge.
• Apply a thin layer of fuel over the seal surface of the new
fi lter cartridge before fi tting it.
• Tighten it by hand until the fi lter makes contact with the
fi lter head then tighten it by a half-turn.
• Untighten the drain valve screw to release the air. Open
the fuel valve again and drain the circuit.
• Start the engine and check the assembly is leak-tight.
I Attention! : Used fi lters must be disposed of in an
appropriate container.