Figure 4-14.Air cleaner.
Route all fuel lines and hoses away from hot or
moving parts. Double-check the clearance after
Only use approved synthetic rubber hoses in a
fuel system. Vacuum hose is NOT to be used as fuel
Make sure fuel hoses completely cover its fitting
or line before installing clamps. Pressure in the fuel
system could force the hose off if not installed properly.
Double-check all fitting for leaks. Start the
engine and inspect the connections closely.
Most fuel injection systems have very high
procedures for bleeding or releasing pressure
before disconnecting a fuel line or fitting. This
action will prevent fuel spray from possibly
causing injury or a fire.
The fuel system mixes air and fuel to produce a
combustible mixture. A large volume of air passes
through the carburetor or fuel injection system and
engine, as much as 100,000 cubic feet of air every 1,000
miles. Air always contains a lot of floating dust and grit.
The dust and grit could cause serious damage if they
entered the engine. To prevent this, mount an air cleaner
(fig. 4-14) at the air entrance of the carburetor or fuel
injection system. The two types of cleaners currently
used are the wet and dry types.
The wet-type. or oil bath, air cleaner consists of the
main body, the filter element that is made of woven
copper gauze, and the cover (fig. 4-15). Operation is as
Incoming air enters between the cover and the
main body. The air is pulled down to the bottom of the
main body where it must make a 180-degree turn, as it
passes over the oil reservoir.
Figure 4-15.Wet-type air filter.