SEAT Workshop Service and Repair Manuals

Note:

Fuel pump relay(J17)

, Fig. 4.

• Cap
• Securing clip
• Seal
• ◆ Renew if damaged
• 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 14
• ◆ Checking , Fig.2
• Pressure retaining valve
• ◆ For fuel tank venting
• ◆ Checking => Page 20-8, Fig. 3
• Return line
• ◆ Blue
• ◆ Check securely seated
• ◆ Clipped onto fuel tank
• ◆ From fuel manifold

=> Repair group 24; Servicing injection system; Removing and installing parts of injection system

• Supply line
• ◆ Black
• ◆ Check securely seated
• ◆ Clipped onto fuel tank
• ◆ To fuel filter
• Connector
• ◆ Black, 4 pin
• 6 Nm
• Filler neck
• ◆ With expansion tank and vent valve
• Vent pipe
• ◆ To junction piece between activated charcoal filter and solenoid valve 1
• Sealing ring
• ◆ Renew if damaged
• Retaining ring

• Vent pipe
• Non-return valve
• ◆ Check for freedom of movement
• 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 line
• ◆ Black
• ◆ To fuel manifold

=> Repair group 24; Servicing injection system; Removing and installing parts of injection system

• Fuel filter
• ◆ Fitting position: Arrow points in direction of flow
• Union nut, 75 Nm
• ◆ Remove and install with spanner 3217
• Fuel delivery unit
• ◆ Removing and installing
  => Page 20-12
• ◆ Checking fuel pump
  => Page 20-17
• ◆ Clean strainer if soiled
• ◆ Note fitting position on fuel tank => Fig. 1
• Sealing ring
• ◆ When installing, insert seal "dry" into fuel tank opening
• ◆ Renew if damaged
• ◆ Moisten with fuel only when installing flange

→ Fig. 1    Installation position of fuel delivery unit flange

Marking on sender must align with the marking on fuel tank -arrows-.

Blue or blue marked return pipe -1- to connection with identification -R-.

Black supply pipe -2- to connection with identification -V-.

Note:

After installing fuel delivery unit flange, check that the supply, return and breather pipes are still clipped onto 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-.

→ Fig.4    Fuel pump relay (J17)

-Relay position 21-

The relay is located on the lower relay carrier of the multi-function unit.

Notes:

• ◆ If tools are necessary to pull relays or control units out of the relay plate, first disconnect battery earth strap.
• ◆ Before disconnecting battery earth strap obtain code for radios with anti-theft coding.