2007 Hummer H2 Owners Manual PDF | Page 395

California Fuel
If your vehicle is certi?ed to meet California
Emissions Standards, it is designed to operate
on fuels that meet California speci?cations.
See the underhood emission control label.
If this fuel is not available in states adopting
California emissions standards, your vehicle will
operate satisfactorily on fuels meeting federal
speci?cations, but emission control system
performance may be affected. The malfunction
indicator lamp may turn on and your vehicle may
fail a smog-check test. See Malfunction Indicator
Lamp on page 215. If this occurs, return to
your authorized GM dealer for diagnosis. If it is
determined that the condition is caused by the type
of fuel used, repairs may not be covered by
your warranty.
Additives
To provide cleaner air, all gasolines in the
United States are now required to contain additives
that will help prevent engine and fuel system
deposits from forming, allowing your emission
control system to work properly. In most cases,
you should not have to add anything to your fuel.
However, some gasolines contain only the
minimum amount of additive required to meet
U.S. Environmental Protection Agency regulations.
To help keep fuel injectors and intake valves
clean, or if your vehicle experiences problems due
to dirty injectors or valves, look for gasoline that
is advertised as TOP TIER Detergent Gasoline.
Also, your dealer has additives that will help
correct and prevent most deposit-related problems.
395

Summary of Content

California FuelIf your vehicle is certied to meet CaliforniaEmissions Standards, it is designed to operateon fuels that meet California specications.See the underhood emission control label.If this fuel is not available in states adoptingCalifornia emissions standards, your vehicle willoperate satisfactorily on fuels meeting federalspecications, but emission control systemperformance may be affected. The malfunctionindicator lamp may turn on and your vehicle mayfail a smog-check test. See Malfunction IndicatorLamp on page 215. If this occurs, return toyour authorized GM dealer for diagnosis. If it isdetermined that the condition is caused by the typeof fuel used, repairs may not be covered byyour warranty.AdditivesTo provide cleaner air, all gasolines in theUnited States are now required to contain additivesthat will help prevent engine and fuel systemdeposits from forming, allowing your emissioncontrol system to work properly. In most cases,you should not have to add anything to your fuel.However, some gasolines contain only theminimum amount of additive required to meetU.S. Environmental Protection Agency regulations.To help keep fuel injectors and intake valvesclean, or if your vehicle experiences problems dueto dirty injectors or valves, look for gasoline thatis advertised as TOP TIER Detergent Gasoline.Also, your dealer has additives that will helpcorrect and prevent most deposit-related problems.395