Audi Workshop Service and Repair Manuals

Note:

Description of function

.

• Baffle housing (outer section)
• ◆ Secured in place in fuel tank
• ◆ Cannot be dismantled
• ◆ Shown without fuel tank for clearer illustration.
• Fuel delivery unit
• ◆ Checking fuel pump (electrical test)
  
• ◆ Removing and installing
  => Page 20-166

• Fuel hose
• ◆ From fuel pump to baffle housing and fuel pump to suction jet pump
• ◆ Use uncoupling tool T40020 or press release tabs on connection to disconnect from suction jet pump.

• Fuel return pipe
• ◆ From fuel filter
• ◆ Note direction of arrow on flange
• Fuel supply pipe
• ◆ Goes to fuel filter
• ◆ Note direction of arrow on flange
• Flange
• ◆ Cannot be replaced separately
• ◆ Installation position: note position of arrow => Page 20-175
• Connector
• ◆ For fuel pump and fuel gauge sender -G
• Union nut, 60 Nm
• ◆ Remove and install with spanner 3217

• Seal
• ◆ Renew
• ◆ When installing, fit seal (dry) in opening in fuel tank
• O rings
• ◆ Always renew
• ◆ Ensure correctly fitted
• Suction jet pump
• ◆ With return pipe
• ◆ Connected to inside of flange
• ◆ Removing and installing
  => Page 20-216
• ◆ Use uncoupling tool T40020 or press release tabs on connection to disconnect

• O ring
• ◆ Always renew
• Fuel gauge sender -G
• ◆ Checking resistance
  => Page 20-176
• ◆ Removing and installing
  => Page 20-179

Description of function

The electric fuel pump delivers fuel from the fuel tank baffle housing to the tandem pump located on the engine.

Therefore it is no longer necessary to bleed the fuel system after running the fuel tank empty or after performing repairs on components of the fuel system.

The electric fuel pump also sends a pressurised stream of fuel into two suction jet pumps (entrainment pumps), one at the bottom of the baffle housing and the other in the rear chamber of the tank. The suction jet pumps ensure that the baffle housing is always kept filled with fuel and the rear chamber of the tank is properly drained.