Benchmark BM Series - Fuel Filter Maintenance; Emission Control System

42
TM
8.6 FUEL FILTER MAINTENANCE
1. Remove the fuel cap and lter.
2. Clean the lter with solvent.
3. Wipe the lter.
4. Reinsert the lter.
8.7 EMISSION CONTROL SYSTEM
Emission Source
Exhaust gas contains carbon monoxide, nitrogen oxides (NOx) and hydrocarbons.
It is very important to control the emissions of NOx and hydrocarbons as they
are a major contributor to air pollution. Carbon monoxide is a poisonous gas. The
emission of fuel vapors is a source of pollution as well. The lawn mower engine
utilizes a precise air-fuel ratio and emission control system to reduce the emissions
of carbon monoxide, NOx, hydrocarbons and evaporative fuel emissions.
Regulation
Your engine has been designed to meet current Environmental Protection Agency
(EPA) clean air standards. The regulations dictate that the manufacturer provides
operation and maintenance standards regarding the emission control systems. Tune
up specications are provided in the Specications section and a description of the
emission control system may be found in the appendix to this manual. Adherence
to the following instruction will ensure your engine meets the emission control
standards.
Modification
Modication of the emission control system may lead to increased emissions.
Modication is dened as the following:
 Disassembling or modifying the function or parts of the intake, fuel or
exhaust system.
 Modifying or destroying the speed governing function of the lawn
mower.