Question

residual pressure, if you dont first depressurize the system. therefore always consult manufacturer service information to determine the correct procedure for relieving residual fuel pressure before you loosen any fuel line connection.
another potential hazard of the injection system is the high voltage used in piezo injectors on some diesel engines. the voltage can be as high as 400 volts; so pay close attention when working on them and always follow manufacturer service precautions and service procedures.
safety recommendations:

• always wear safety glasses.
• wear disposable gloves that are resistant to fuel.
• always use line wrenches to loosen fuel line fittings, never use an open end wrench that can slip.
• never smoke or have an open flame or torch around the fuel tank lines and hoses.
• know where the shop fire extinguishers are located. aim extinguisher at the base of the fire.

2
how do you work safely around fuel systems?
always follow manufacturer published safety and service procedures.
if a flash fire breaks out, aim the extinguisher toward the top of the flames.
to depressurize a fuel system, turn the ignition off and use a line wrench to crack open a line at the fuel rail and let the pressure drain off.
always wear safety glasses and fuel resistant disposable gloves.
never remove a fuel system component without first depressurizing the system according to manufacture instructions.
dont smoke while working on or around fuel systems and know where the shop fire extinguishers are located.

Explanation:

The text provides safety guidelines for working around fuel systems. It mentions following manufacturer - published safety and service procedures, wearing safety glasses and fuel - resistant disposable gloves, not smoking around fuel systems, knowing the location of fire extinguishers, and depressurizing the system before component removal. It also corrects that the extinguisher should be aimed at the base of the fire, not the top of the flames, and that depressurizing involves consulting manufacturer information rather than just cracking open a line.

Answer:

1. Always follow manufacturer published safety and service procedures.
2. Always wear safety glasses and fuel resistant disposable gloves.
3. Never remove a fuel system component without first depressurizing the system according to manufacture instructions.
4. Don't smoke while working on or around fuel systems and know where the shop fire extinguishers are located.