Checking fuel lines

• Expose the heater and fuel lines:
  • For cars manufactured up to w38 2001 inclusive, see Engine coolant heater, replacing
  • For cars manufactured from w39 2001 inclusive, see Engine coolant heater, replacing .

  Check the fuel lines between the connection point to the fuel injection system and heater via the fuel pump (FP). Check for damage and leakage.

  Check the fuel lines for blockages.

Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

  Refer to Checking components