Fuel supply system - natural gas engines

Chapter overview

• Technical data
  1
• 1 Safety information
  1
• 1.1 Safety precautions when working on vehicles with a gas system
  1
• 1.2 Safety regulations for working on fuel supply
  3
• 1.3 Safety measures when working on vehicles with a start/stop system
  4
• 1.5 Safety precautions when working on exhaust system
  4
• 2 Identification
  5
• 2.1 Engine number/engine data
  5
• 3 General information
  6
• 4 Repair instructions
  7
• 4.1 Rules for cleanliness
  7
• 4.2 General information
  8
• 4.3 Contact corrosion
  9
• 4.4 Routing and attachment of lines
  9
• 4.5 General repair instructions
  9
• Fuel supply system
  10
• 1 Fuel system
  10
• 1.1 Overview of fitting locations - fuel system
  10
• 2 Fuel
  13
• 2.1 Assembly overview - fuel tank
  13
• 2.2 Assembly overview - fuel tank shut-off valve
  22
• 2.3 Emptying fuel tank
  26
• 2.4 Removing and installing fuel tank
  37
• 2.5 Removing and installing fuel tank shut-off valve
  46
• 2.6 Releasing high pressure in fuel system
  56
• 2.7 Removing and installing solenoid of fuel tank shut-off valve N361/N362
  57
• 2.8 Removing and installing filling connection
  59
• 2.9 Determining residual pressure in natural gas fuel tank
  61
• 3 Fuel delivery unit, fuel gauge sender
  75
• 3.1 Assembly overview - fuel delivery unit/fuel gauge sender
  75
• 3.2 Removing and installing fuel delivery unit, fuel gauge sender
  77
• 3.3 Removing and installing fuel gauge sender G
  79
• 4 Plug-in connectors
  81
• 4.1 Separating plug-in connectors
  81
• 5 Fuel filter
  87
• 5.1 Assembly overview - fuel filter
  87
• 5.2 Removing and installing fuel filter
  89
• 6 Activated charcoal filter system
  91
• 6.1 Assembly overview – activated charcoal filter system
  91
• 6.2 Checking fuel tank breather
  91
• 7 Accelerator pedal
  93
• 7.1 Assembly overview - accelerator module
  93
• 7.2 Removing and installing accelerator pedal module GX2
  93
• 8 Fuel pump
  97
• 8.1 Checking fuel system pressurisation pump G6
  97
• 9 Checking natural gas supply system for leaks
  116
• 9.1 Identifying pressure sections and allocating leakage test
  116
• 9.2 Determining pressure in gas system
  119
• 9.3 Determining operating mode of natural gas vehicles
  120
• 9.4 Activating and deactivating natural gas mode
  120
• 9.5 Checking gas system for leaks
  121