Page 46 - Propane Vehicle Essentials and Safety Practices

Identify the circumstances when propane
Propane Vehicle Essentials and Safety Practices 1 fuel systems must be depressurized versus
when they must be defueled

Module 6 Learning 2 Describe generic practices for depressurizing
propane fuel systems
Propane Vehicle Depressurizing Objectives

and Defueling 3 Describe typical defueling equipment and
plumbing
4 Identify the main defueling methods

1 2

Depressurize or Defuel?

• Depressurize
o If repair is downstream
of the supply valve (between the supply
Lesson 6.1 and return valve) or the component can
be isolated by the closing the supply Return Valve
and return valve
Depressurize or Defuel? o DOES NOT DRAIN THE TANK OR ITS
COMPONENTS
• Defuel Supply Valve
o If the gas supply cannot be isolated by
closing the supply and return valve

3 4

1