This is a genuine OEM replacement part, it is sold individually.
The purpose of the filter is to keep dust and debris from contaminating the carburetor and engine.

To replace the filter you can place it in a plastic bag with a little oil and rub the oil into the filter.
Then remove the filter and squeeze it in a paper towel to remove the excess oil.

The 791-682039 Fuel Filter and Line, filters the fuel in the tank as it is forced into the carburetor up by means of the primer bulb.

To install.
Remove retainer ring from fuel line.
Insert fuel line thru gas cap opening.
Thread fuel line thru hole in bottom of the fuel tank.
Pull fuel line thru to firmly seat against inside tank wall.
Put retainer ring on fuel line,hold line and press ring firmly against the out side of the fuel tank wall.
Then attach fuel line to correct line on the carburetor.

The filter will at sometime get clogged with dirt and debris that has collected in the fuel tank, and will have to be replaced.

The primer hose is inserted into the fuel tank then connected to the Primer.
By pressing on the primmer a few times this assembly fills the carburetor with fuel.
When the carburetor has enough fuel in it, the excess fuel is forced back into the the tank through the fuel return line.

After time the primer hose will become brittle and crack and have to be replaced.
The primer will also lose its elasticity, and may also crack and not be able to suck up the fuel into the carburetor.
And will have to be replaced.

The purpose of the 791-181086 Fuel Return Tube is to return the excess fuel back into the fuel tank, after the primer bulb has been pressed and has primed the carburetor to start.

After time the Fuel Return Line will become brittle and crack and will need to be replaced.

This is a genuine Ruixing replacement part, it is sold individually.
By pressing the bulb, it will purge the carburetor of air.
Fuel will be forced up from the fuel tank through the fuel line then into the carburetor.
Then the excess fuel will be forced back into the fuel tank through the fuel return line.

At some time the primer will lose its elasticity or crack and need to be replaced.

We have an article and video on How to Replace a Primer Bulb, in our Repair Center. That can be found on the front page of our site.

This is an OEM replacement part,it is sold individually.
The purpose of the Air Purge Bulb is to purge all of the air from the carburetor.
It then brings fuel up through the fuel line in the tank into the carburetor.
Once the carburetor is full of fuel the Bulb will force the excess fuel back into the tank through the fuel return line.

Over time the bulb will loose it elasticity or begin to crack, it will need to be replaced at this time.