Fuel System; Fuel Tank Ventilation; Checking The Fuel Tank Ventilation - Husqvarna 50 Workshop Manual

10

Fuel Tank Ventilation

Checking the Fuel Tank Ventilation

Empty the fuel tank. Tighten the fuel tank cap.
Disconnect the fuel hose at the carburetor and attach the
pressure gauge P/N 5025038-01 to the hose.
Pressurize the fuel tank to 50 kPa (7.2 psi) as indicated
by the pressure gauge. The pressure should reduce to
20 kPa within 60 seconds (3 psi/60 sec.). The fuel tank
ventilation should be serviced if the pressure reduction to
20 kPa takes longer than 60 seconds.
Some two-stroke engine oils and fuel: oil mixture
ratios can restrict fuel tank ventilation. If the vent
fails the previously described test requiring vent
servicing, future fuel tank ventilation problems may
be prevented by ensuring that the operator is follow-
ing the recommended fuel mix instructions in the
Operator's Manual supplied with the saw.
Disassembly
The fuel tank vent is located on the right side of the fuel
tank next to the right rear rubber element. With the fuel
tank empty and the fuel hose disconnected at the
carburetor, remove the two rear rubber elements as
described in section 9. Anti-Vibration System. Separate
the rear of the crankcase and the fuel tank enough to
expose the fuel tank vent.
Working through the fuel filler opening, grasp the fuel
tank vent tube with a pair of needle nose pliers. Push the
vent out the other side.
NOTE !