FUEL SYSTEM AND GOVERNOR
37
The function of the fuel system is to store fuel, mix the fuel with air in the correct ratio and deliver it to the intake
port. The fuel system consists of the following components:
• Fuel tank
• Fuel lines
• Fuel filter
• Carburetor and insulator block
NOTE: When working on the fuel systems, look at the whole system. A problem will rarely be isolated to one
component.
Fuel Line
The fuel line used by MTD is GREENBAR
TM
. This is
a multi-layer fuel line that meets the current EPA guide-
lines.
NOTE: This fuel line has a thin inner liner. If a tear
forms in this inner liner, fuel can get between
the liner and the hose. This will cause the
liner to collapse, cutting off the fuel flow.
NOTE: The fuel line must be replaced every time it
is disconnected from the brass barb on the
carburetor.
NOTE: Replace the fuel line only with GREEN-
BAR
TM
700 series fuel line.
Inspect the fuel lines
• Are they cracked?
• Are they clogged?
• Are they brittle?
NOTE: If the answer to any of the above is yes,
replace the fuel lines. When replacing fuel lines, low permeable fuel line must be used in order to meet
EPA and CARB standards.
NOTE: The nipple has a sharp edge that will damage the inner lining of the fuel line. Replace the fuel line
every time it is removed from the carburetor fuel nipple.
• Drain the fuel tank or clamp the fuel line before starting work to prevent spillage.
• Dispose of drained fuel in a safe and responsible manner.
Figure 4.1
NBR inner liner
THV barrier layer
NBR intermediate layer
Reinforcement
CSM Cover
Picture courtesy of Avon Automotive
When working around the fuel system, do not bring any sources of heat, spark, or open flame
near the work area.
CHAPTER 4: THE FUEL SYSTEM AND GOVERNOR
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