Jonsered 2054 Workshop Manual

51
4
A
B
C
Fuel system
Fuel tank vent
The tank air vent has a great effect on the function of the carburettor. If it is not func-
tioning either an overpressure or underpressure can develop in the tank.
Overpressure results in flooding the carburettor.
Underpressure results in diminished or no fuel flow to the carburettor.
The purpose of the tank air vent is therefore to maintain atmospheric pressure in the
tank during all operating conditions.
A = Expansion volume
B = Non return valve
C = Filter
Function check
Empty the fuel tank and tighten the tank cap.
Connect the pressure gauge to the fuel pipe (the carburettor may have to be dismantled
to gain access to the pipe).
Overpressure
Pump up a pressure of 50 kPa (0.5 kp/cm
2
).
The pressure should fall to 20 kPa (0.2 kp/cm
2
) within 60 seconds.
Underpressure
Reduce the pressure to – 50 kPa (0.5 kp/cm
2
).
The pressure should increase to 20 kPa (0.2 kp/cm
2
) within 30 seconds.
Model 2036/2040
Dismantle the carburettor and spacing
piece in order to access the valve for
cleaning.
Model 2041/2045/2050
Clean the filter at the pipe end at regular
intervals.
Model 2036/2040
The tank air vent here is a sintered bronze
filter which is pressed secure in the fuel
tank.
It is accessible for external cleaning when
the carburettor and spacing piece are
dismantled.
See chapter 8 ”Crankshaft and crankcase”
for information on replacing.
Model 2041/2045/2050
The tank air vent consists of a pipe. One
end is connected to the top of the tank in
the carburettor chamber.
The other end opens into the area between
the handlebar and the clutch cover.
There is a sintered bronze filter in the pipe
which must be cleaned from dirt at regular
intervals.

Jonsered 2054 Specifications

General

Brand	Jonsered
Model	2054
Category	Chainsaw
Language	English