107FS 240 C, FS 260 C, FS 360 C, FS 410 C, FS 460 C-M
11.8 Tank vent
11.8.1 Testing
If problems develop in the
carburetor or fuel supply, the tank
vent must always also be tested and
replaced if necessary. Correct
functioning is determined by testing
the fuel tank under vacuum or at
gauge pressure via the fuel hose.
– Open filler cap and drain fuel
tank, b 1
– Close the filler cap
– Remove filter housing, b 11.2
: Pull out connector (1) with fuel
hose (2)
– Pull connector off of fuel hose
: Push the connector (1)
0000 855 9200 into the fuel
suction hose (arrow)
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2
1
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: Pull off the fuel return line (1) at
the connector of the carburetor
and seal with a suitable
stopper (2)
Testing with negative pressure
: Slide ring (1) to the left and
connect the pump (2)
0000 850 1300 to the double
nipple (arrow)
– Create vacuum in fuel tank
Pressure is equalized via the tank
vent. A negative pressure must not
build up inside the tank.
– Clean the area around the tank
vent
– Always use a new fuel hose
– Replace the tank vent or tank if
necessary, b 11.8 or b 11.9.3
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2
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2
Testing with gauge pressure
: Slide ring (1) to the right and
connect the pump (2)
0000 850 1300 to the double
nipple (arrow)
– Create excess pressure in fuel
tank
– Actuate the pump until the
pressure gauge shows a
pressure of 0.5 bar. If this
pressure remains constant for at
least 20 seconds, the tank and
tank vent are airtight. If the
pressure drops, the leak must be
located and the defective part
replaced.
– Replace the tank vent or tank if
necessary, b 11.8 or b 11.9.3
– Always use a new fuel hose
– Reassemble parts in reverse
order
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