SEAT Workshop Service and Repair Manuals

Note:

After all repairs to the fuel supply unit or the fuel gauge sender unit have been carried out, ensure the the supply or return flow hoses do not make contact with the fuel tank (pump noises may be transferred).

• Cap
• ◆ Pressure control valve opens at approx. 250 mbar
• Seal
• ◆ If damaged only replace together with cap
• Retaining ring
• Rubber cup

• Gravity valve
• ◆ To remove valve unclip upwards out of filler neck
• ◆ Check valve for through-flow
  valve vertical: open,
  valve tilted 45 °: closed
• O-ring
• ◆ Renew if damaged
• Vent valve
• ◆ Cannot be removed, replace together with filler neck => item 17
• ◆ Checking , Fig.2
• Pressure retaining valve
• ◆ For fuel tank venting
• ◆ Checking , Fig. 3

• Return pipe
• ◆ Secure with spring-type clips
• ◆ Check securely seated
• ◆ Blue
• ◆ From fuel manifold

=> Repair group 24; Simos injection and ignition system; Servicing injection part

• Union nut
• ◆ Remove and install with 3217
• Connector
• ◆ Black, 4 pin
• ◆ For fuel gauge sender (G) and fuel pump (G6)
• Flange
• ◆ Note fitting position on fuel tank => Page 20-8, Fig. 1
• ◆ Underside marked with "V" and "R" for supply and return hoses

• Supply hose
• Sealing ring
• ◆ Coat with fuel when installing
• ◆ Renew if damaged
• Return hose
• 6 Nm
• Filler neck
• ◆ With expansion tank and vent valve
• Vent pipe
• ◆ To junction piece between activated charcoal filter and solenoid valve 1
  , item 3
• Sealing ring
• ◆ Renew if damaged

• Retaining ring
• Non-return valve
• ◆ Check for freedom of movement
• Vent pipe
• 25 Nm
• Fuel tank
• ◆ Support with engine and gearbox jack V.A.G 1383 A when removing
• Securing strap
• ◆ Note differing length
• 20 Nm
• Bracket
• ◆ For fuel filter

• Supply pipe
• ◆ Secure with spring-type clips
• ◆ Check securely seated
• ◆ Black
• ◆ To fuel manifold

=> Repair group 24; Simos injection and ignition system; Servicing injection part

• Fuel filter
• ◆ Installation position: Arrow points in through-flow direction
• Fuel gauge sender (G)
• Fuel delivery unit
• ◆ Removing and installing
  => Page 20-15
• ◆ Checking fuel pump
  => Page 20-18
• Strainer

→ Fig. 1    Installation position of fuel delivery unit flange

Marking on the flange must align with marking on the fuel tank.

→ Fig. 2    Checking vent valve

Valve in rest position: Closed

Valve pushed in direction of arrow: Open

→ Fig. 3    Checking pressure retaining valve

From the gravity valve direction the pressure retaining valve is open in both directions of flow -arrow -1-.

From the direction junction piece activated charcoal filter/solenoid valve 1 it is only open in one direction of flow -arrow -2-.