Discovery 2. Manual — part 52

EMISSION CONTROL - V8

DESCRIPTION AND OPERATION

17-2-3

Evaporative emission system
component layout

1 Purge valve
2 Service port
3 Snorkel tube (UK / ROW only)
4 CVS unit (NAS vehicles with vacuum type leak

detection only)

5 EVAP canister breather tube
6 Vent pipe – fuel tank to EVAP canister
7 Relief valve regulated flow
8 Relief valve (UK / ROW only)
9 Relief valve free flow

10 Fuel filler cap
11 Liquid vapour separator #

(UK / ROW type shown)

12 Fuel filler hose (UK / ROW type shown)
13 Tank breather hose (UK / ROW only)
14 Vent hose
15 Roll over valves (ROV's) –

(4 off, UK / ROW spec. shown)

16 Fuel tank and breather assembly
17 EVAP canister
18 Purge line connection to engine manifold
19 Tank EVAP system pressure sensor (NAS

vehicles with vacuum type leak detection only)

M17 0209

4

3

1

6

5

16

10

8

13

17

9

7

11

12

15

14

18

2

19

EMISSION CONTROL - V8

17-2-4

DESCRIPTION AND OPERATION

Evaporative emission system (with
positive pressure leak detection)
component layout (NAS only)

1 Purge valve
2 Service port
3 Air filter canister
4 EVAP canister breather tube
5 Leak detection pump
6 EVAP canister
7 Vent pipe – fuel tank to EVAP canister
8 Liquid vapour separator (metal)

9 Fuel filler cap

10 Fuel filler
11 Fuel tank breather assembly
12 Vent hose
13 Roll over valves (inside fuel tank)
14 Fuel tank
15 Purge line connection to engine manifold

M17 0208

3

1

7

4

14

11

6

8

10

13

12

15

2

5

9

EMISSION CONTROL - V8

DESCRIPTION AND OPERATION

17-2-5

Evaporative emission system control
diagram

1 Battery
2 Fuse 13 (engine compartment fusebox)
3 Inertia switch
4 Main relay (engine compartment fusebox)
5 Engine Control Module (ECM)
6 Purge Valve (black harness connector)
7 Canister vent solenoid (CVS) valve – NAS

vehicles with vacuum type EVAP system leak
detection capability only

8 Leak detection pump – NAS vehicles with

positive pressure type EVAP system leak
detection capability only

9 Fuel tank pressure sensor – NAS vehicles with

vacuum type EVAP system leak detection
capability only

10 Instrument pack (MIL warning light)

M17 0210

1

2

3

4

5

6

7

9

8

10

EMISSION CONTROL - V8

17-2-6

DESCRIPTION AND OPERATION

Secondary air injection system
component layout

M17 0206

1

2

3

4

5

6

8

7