Tank Venting; Fuel Pump - Husqvarna 129C Workshop Manual

Repair Instructions

7.12 Tank venting

The tank venting valve is fitted in a separate hose
from the fuel tank and it is important that the valve
functions for engine operation, especially at low
speeds, i.e. to allow air into the tank but prevent
fuel from being forced out.
1
Empty the fuel from the tank and remove the fuel
hose from the carburettor.
2
Connect the fuel hose to pressure tester no.
531 03 06-23. See figure 37. Check that there is no
vacuum build up in the tank.
4
Remove the filter housing (A) from the bracket (D)
on the carburettor cover using flat nose pliers.
Remove the filter (C) using a pointed object. Clean
the filter in warm soapy water. A damaged filter
should be replaced with a new filter.
Remove the non-return valve (B) using a pointed
object. If the sealing slot in the flat end of the valve
is damaged, the valve must be replaced.
See figure 38.

7.13 Fuel pump

The fuel pump has the task of facilitating the
start of the engine when cold. The pump fills the
carburettor with fuel before attempting to start the
engine. This also prevents vapour bubbles from
blocking the narrow fuel channels.
If the pump does not work it must be replaced.
Note how the fuel hoses are connected to simplify
assembly.
34
- English
Fig 37
Fig 38
Fig 39