Hisun HS 400 Owner's Manual page 40

① Air filter element
① Air filter frame
③ Element retaining plate
① Holder ② Air filter case cover
IMPORTANT

Do not run the engine with the filter element
removed.

Be sure to refit the cover with the arrow (on
the rear of cover) upright if the cover is
improperly fitted the evacuator valve will not
function and dust will adhere to the element.
PERIODIC SERVICE 11-1
② Air filter element
◆ Evacuator Valve
Open the air cleaner cover once a week under
ordinary conditions –or daily when used in a dusty
place-to get rid of large particles of dust and dirt.
Check fuel line and fuel filter.
CAUTION
To avoid personal injury:

Be sure to stop the engine and remove the
key when attempting to make the following
checks and changes.

Never fail to
periodically. The fuel lines are subject to
wear and aging fuel may leak out onto the
running engine causing a fire.

The fuel line connections should be
checked annually or every 100 service
hours whichever comes first.
1. Park the vehicle on a flat surface and raise the
cargo bed.
2. The fuel line is made of rubber and ages
regardless of service period.
3. If the fuel line and clamps are found to be
damaged or deteriorated replace them.
4. Check the fuel filter. If it is clogged by debris or
contaminated with water replace it.
IMPORTANT
When the fuel line is disconnected for maintenance
or repair cover both ends of the fuel line with a
piece of clean cloth or paper to prevent dust and
dirt from entering, in addition particular care must
be taken not to admit dust and dirt into the fuel
pump entrance. Even a small amount of dust or dirt
will cause premature wear and a malfunction of the
fuel pump and injector components.
check the fuel lines