GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 Yukon XL - 4WD 🢒 Engine 🢒 Engine Controls - 8.1L 🢒 Emission Hose Routing Diagram
Figure 1:

Vacuum Hose Routing
Object Number: 344974 Size: SH
(1)Manifold Absolute Pressure (MAP) Sensor
(2)EVAP Canister Purge Hose
(3)EVAP Service Port
(4)Positive Crankcase Ventilation (PCV) Valve
(5)Throttle Body
(6)EVAP Canister Purge Valve
(7)AIR Module, if equipped
Figure 2:

EVAP System Overview
Object Number: 678941 Size: LF
(1)EVAP Canister Purge Solenoid
(2)EVAP Canister
(3)Fuel Fill Neck/Fill Cap
(4)Rollover Valve/Fuel Tank Pressure (FTP) Sensor
(5)Fuel Tank
(6)EVAP Canister Vent Solenoid
(7)Vent Hose/Pipe
(8)EVAP Vapor Pipe
(9)EVAP Purge Pipe
(10)EVAP Service Port
Figure 3:

EVAP Hose/Pipe Routing W/Dual Tanks and One Fill Neck
Object Number: 678911 Size: LF
(1)EVAP Canister Purge Valve
(2)EVAP Canister
(3)EVAP Vapor Pipe
(4)Front Fuel Tank
(5)Fuel Fill Neck
(6)Rear Fuel Tank
(7)EVAP Canister Vent Valve
(8)Vent Hose/Pipe
(9)EVAP Purge Pipe
(10)EVAP Service Port