Fuel Supply; Cleaning The Fuel Tank; Fuel Hoses And Pickup Body - Stihl 4180 Series Manual

6.6

Fuel Supply

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.
In the event of problems with the
fuel supply system, always check
the fuel tank and the pickup body
first.
Clean the fuel tank if necessary,
b 6.6.1.
After completing servicing work on
the fuel system:
– Test the fuel system for leaks,
b 6.5.1
Series 4180 Powerhead
6.6.1

Cleaning the Fuel Tank

1
: Unscrew the filler cap (1) and
drain the tank.
– Pour a small amount of clean
gasoline into the tank and shake
the unit vigorously.
– Open the tank again and drain it.
Dispose of fuel properly in
accordance with environmental
requirements.
6.6.2 Fuel Hoses and Pickup
Body
Depending on the type of fuel tank,
two different fuel supply systems
are installed:
One-part system (molded hose),
grommet and hoses are in one
piece.
Multi-part system, connector and
hoses are available as separate
items.
Differences in removal and
installation procedures are
described below.
– Pull the fuel hoses off the
carburetor, b 6.2.2
1
One-part system
: Carefully pry the grommet (1) out
of the fuel tank, taking care not to
damage the tank.
: Pull the fuel hoses with pickup
body out of the tank.
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