Stihl 088 - Tank Vent, Pickup Body, and Fuel Hoses

STIHL 088 51
10.3 Tank Vent
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: In the event of trouble with
the carburetor or the fuel supply
system, always check and clean the
tank vent.
10.4 Pickup Bod
y
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
eventually 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.
Equalization of pressure from the
inside outwards takes place via the
bore in the tank, the valve and
sintered filter.
- Remove the carburetor box cover -
see 10.1.
Equalization of pressure from the
outside inwards takes place via the
sintered filter (1) and the valve (2).
Note: The sintered filter helps prevent
dirt entering the valve or the tank. The
cap (3) protects the sintered filter from
damage and contamination.
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 saw
vigorously.
- Open the tank again and drain it.
Note: Dispose of old fuel at approved
disposal site.
• Pull the sintered filter (1) and
valve (2) out of the tank.
• Pull off the cap.