Correct operation of the carburetor
is only possible if atmospheric
pressure and internal fuel tank
pressure are equal at all times.
This is ensured by the tank vent.
Important:If problems occur on
the carburetor or the fuel supply
system, always check and clean
the tank vent.
Check function by performing
pressure and vacuum tests on
the tank via the fuel hose.
Equalization of pressure from the
outside inwards takes place via
the hole in the fuel filler cap, the
sintered filter, the valve and holes
in the cap.
Equalization of pressure from the
inside outwards takes place via
the holes in the cap, the holes in
the valve body, the sintered filter
and the hole in the fuel filler cap.
Cleaning
- Unscrew the fuel filler cap.
•
Ease the cap (1) off the valve
body (2).
•
Take sintered filter (3) out of cap.
•
Pry valve body out of fuel filler
cap (4).
•
Pry sintered filter (5) out of fuel
filler cap.
- Wash valve body in clean
gasoline.
•
If diaphragm in the valve (6) is
damaged, pull it out of valve
body and fit new one.
•
Push new sintered filter (5) into
filler cap.
•
Fit sealing ring (7) over valve
body.
- Fit valve body in filler cap and
press it home until it snaps into
position.
- Fit new sintered filter in the cap.
- Fit cap on valve body and press
it down until it snaps into position.
- Refit the fuel filler cap.
The diaphragm pump draws fuel
out of the tank and into the
carburetor via the fuel hose. Any
impurities mixed with the fuel are
retained by the pickup body (filter).
The fine pores of the filter even-
tually become clogged with minute
particles of dirt. This restricts the
passage of fuel and results in fuel
starvation.
Important:In the event of trouble
with the fuel supply system,
always check the fuel tank and
the pickup body first. Clean the
fuel tank if necessary.
Cleaning the fuel tank
- Unscrew the filler cap and drain
the tank.
- Pour a small amount of clean
gasoline into the tank.
- Close the tank and shake the
unit vigorously.
- Open the tank again and drain it.
Note:Dispose of fuel properly.
Pickup body
- Unscrew the filler cap and re-
move it together with the retainer.
8.3 Tank Vent 8.4 Pickup Body
2
5
0
R
A
2
2
5
1
7
3
2
5
6
4
V
A
2
5
0
R
A
2
2
3
V
A
2
5
0
R
A
2
2
4
V
A
44 FS 120, 200, 300, 350, 400, 450, FR 350, 450
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