Fuel Filter: Diagrams

EVAP System, Overview

NOTE:
- Components marked with * are checked via On Board Diagnostic (OBD):
- Components marked with ** are tested via output Diagnostic Test Mode (DTM):


1 - Intake manifold
2 - Evaporative Emission (EVAP) canister purge regulator valve -N80- */**
- With engine at operating temperature, valve is activated (pulsed) via the Motronic Engine Control Module (ECM) -J220-
- Installation position: Arrow points in direction of flow
3 - Test connection
- Installation location, See Fig 1
4 - Gravity valve
- for filler ventilation
- cannot be removed, only replace together with fuel tank
5 - Return line
6 - Fuel rail with fuel injectors
7 - Supply line
8 - Fuel filter
- Installation position: Arrow points in direction of flow
9 - Fuel pump
10 - Combination valve
- Vacuum protection valve
- for leak diagnostic test
11 - Fuel tank
12 - Leak diagnostic line
13 - Expansion tank
- Filler ventilation
14 - Gravity valve
- Operating ventilation
- cannot be removed, only replace together with fuel tank
15 - Vent line
- Filler ventilation
16 - Pressure retention valve
- clipped in at EVAP canister
17 - EVAP canister
- Installation location: connected at left longmember
18 - Vent line
19 - Evaporative Emission (EVAP) Canister Purge Regulator Valve -N115-
- During leak diagnostic, valve is activated via the Motronic Engine Control Module (ECM) -J220-
- Secured at EVAP canister with bracket
20 - Air filter for diagnostic pump
21 - Intake line
- clipped into left longmember
22 - Leak Detection Pump (LDP) -V144-*/**
- Installation location: behind fuel tank at left longmember
23 - Vacuum line
24 - Vent line
- into the environment
- clipped into left longmember
25 - Vent line
- Operating ventilation
26 - Check-valve
- for leak diagnostic test: Sealing cap/filler tube
27 - Cap
28 - To engine
29 - 2-way valve
- cannot be removed, only replace together with fuel tank
30 - Expansion tank
- for ventilation line
- cannot be removed, only replace together with fuel tank
31 - Flush line
- to test connection/solenoid valve 1 in engine compartment

Fig. 1 Test connection







Test connection (arrow) with green protective cap. Damage leads to leaks and malfunction recognition of EVAP system.