Fuel Tank - Husqvarna 131RB Workshop Manual

8.6.3 To clean and examine the air filter
CAUTION: Do not use gasoline to clean the air
filter, it will damage the air filter.
1. Examine the air filter. If the air filter is damaged,
replace it with a new air filter.
2. Clean the air filter with warm water and cleaning
agent. Make sure to use the correct cleaning agent,
Servicing tools for 967 84 33-xx and 967 84 32-
see
xx on page 18 . Flush the air filter with warm water
until it is free of cleaning agent.
3. Soak the air filter with oil. Put the air filter in a plastic
bag and put about a tablespoon of oil into the bag.
make sure to use the correct oil, see
for 967 84 33-xx and 967 84 32-xx on page 18 .
Press the outside of the plastic bag to apply the oil
equally in the air filter.
8.6.4 To assemble the air filter
1. Assemble in the opposite sequence to how it was
disassembled.

8.7 Fuel tank

8.7.1 To do a fuel tank venting
Fuel tank venting must be done correctly for the engine
to operate satisfactorily.
1. Empty the fuel tank.
2. Remove the air filter cover.
3. Remove the transparent fuel hose from the
carburetor.
627 - 002 - 23.04.2018
4. Connect the fuel hose to a pressure tester. Refer to
Servicing data for the model 967 84 33-xx on page
14 .
Servicing tools
5. Examine the hose bushings in the fuel tank for
leaks.
6. Put your thumb on the hole in the fuel tank cap.
7. Pump up a vacuum of 0.5 bar in the fuel tank.
8. Remove your thumb from the hole in the fuel tank
cap.
The pressure decreases to atmospheric pressure in less
than 15 seconds.
8.7.2 To clean and examine the fuel tank
1. Disassemble the fuel tank cap for cleaning. Use a
screwdriver to remove the housing (A) that contains
the check valve (B) and cover (C).
2. Use compressed air to clean the filter (D) and the
hole in the fuel tank cap (E).
3. Examine the check valve.
a) Press the sides of the check valve to see a small
b) Replace the check valve if it is damaged.
4. Assemble the fuel tank cap. Make sure the seal (F)
is not damaged.
5. Attach the fuel tank cap to the fuel tank.
space (G). If you can see the space when you
do not press the sides of the check valve, the
valve is damaged.
E E
F
D
B G A
C
Repair instructions - 37