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531 03 06-23
531 00 60-76
502 50 83-01
Tank venting
Check that the tank venting valve works
correctly.
Replace the fuel cap if the valve is
faulty.
Tank venting
Tank venting takes place through the
fuel cap and needs to be functional for
the engine to work.
• Remove the fuel hose from the
carburettor and empty the fuel from
the tank.
• Connect the fuel hose to pressure
tester no. 531 03 06-23.
• Pump up a pressure and vacuum of
50 kPa (0.5 bar) in the tank.
• The pressure should sink to 20 kPa
or return to normal pressure within 45
seconds.
Fuel system
The fuel cap can be taken apart for
cleaning.
Use a screwdriver and prise off the
housing (A) that contains a rubber
diaphragm (B) and a filter (C).
Knock the housing against a tabletop
so that the cover (D) over the dia-
phragm falls off.
Blow the filter (C) clean, and the
sintered filter (E), with compressed air
and mount the fuel cap in the reverse
order to how it was disassembled.
Make sure that the flat surface on the
cover (D) is turned towards the dia-
phragm.
Impregnate the filter with air filter oil. Impregnate the filter with air filter oil.
Tip!
Place the filter in a plastic bag and
pour about a tablespoon of air filter
oil no. 531 00 60-76 into the bag.
Massage the oil into the air filter.
Fuel filter
The fuel filter can be removed through
the tank’s fill hole.
Fuel filter
The fuel hose in the tank contains a
fuel filter. It is accessible through the fill
hole. Pull out the filter with your fingers
or with help of tool 502 50 83-01.
NOTE!
The fuel filter can snag under the
shaft bushing in the tank. With the
aid of a long screwdriver, loosen
the filter. Do not pull on the hose,
since it can easily be pulled from
the filter.