Fuel System; Service Precautions - Chevrolet Trailblazer Service Manual

FUEL SYSTEM

Service Precautions

Safety is the most important factor when performing not only fuel system maintenance but
also any type of maintenance. Failure to conduct maintenance and repairs in a safe
manner may result in serious personal injury or death. Maintenance and testing of the
vehicle's fuel system components can be accomplished safely and effectively by adhering
to the following rules and guidelines.
Always wear safety glasses or some type of eye/face protection when working with,
around or under a vehicle.
To avoid the possibility of fire and personal injury, always disconnect the negative
battery cable unless the repair or test procedure requires that battery voltage be
applied.
Always relieve the fuel system pressure prior to disconnecting any fuel system
component (injector, fuel rail, pressure regulator, etc.), fitting or fuel line
connection. Exercise extreme caution whenever relieving fuel system pressure, to
avoid exposing skin, face and eyes to fuel spray. Please be advised that fuel under
pressure may penetrate the skin or any part of the body that it contacts.
Always place a shop towel or cloth around the fitting or connection prior to
loosening to absorb any excess fuel due to spillage. Ensure that all fuel spillage
(should it occur) is quickly removed from engine surfaces. Ensure that all fuel
soaked cloths or towels are deposited into a suitable waste container.
Always keep a dry chemical (Class B) fire extinguisher near the work area.
Do not allow fuel spray or fuel vapors to come into contact with a spark or open
flame.
Always use a back-up wrench when loosening and tightening fuel line connection
fittings. This will prevent unnecessary stress and torsion to fuel line piping.
Always replace worn fuel fitting O-rings with new. Do not substitute fuel hose or
equivalent where fuel pipe is installed.
Do not smoke or carry lighted tobacco or open flame of any type when working on
or near any fuel-related component. Highly flammable mixtures are always present
and may be ignited. Failure to follow these instructions can result in personal injury.
Do not carry personal electronic devices such as cell phones, pagers or audio
equipment of any type when working on or near any fuel-related components.
Highly flammable mixtures are always present and may be ignited. Failure to follow
these instructions can result in personal injury.
Fuel in the fuel system remains under high pressure even when the engine is not
running. Before servicing or disconnecting any of the fuel system components, the
fuel system pressure must be relieved to prevent accidental spraying of fuel,
causing personal injury or a fire hazard.