Advanced EVAP System

Evaporative Emission Control System - Advanced Evaps

Evaporative Emissions System Component Locations:

Fuel filler neck components





A Anti-trickle fill valve
B Liquid/vapor Separator
C Vent line to pressure sensor
D From fuel tank to liquid/vapor separator
E From EVAP canister to anti-trickle fill valve
F Fuel filler hose, Dual layer, convolute nylon
G Fuel tank internal breather hose

Identification

The system was introduced on all North American specification vehicles from October 1996 and the vehicles can be recognized by the information contained in the EVAP. FAMILY entry on the underbonnet Emission label (mounted on the vertical face of the bonnet lock platform).





A - Vehicles with advanced EVAPS
VLR1 1 24AYPFE

B - Vehicles without advanced EVAPS
VLR1 0 60AYPBC

Description And Operation - Advanced EVAPS





1. Fuel filter
2. Fuel pump and gauge sender unit
3. Fuel feed hose
4. Fuel return hose
5. Fuel filler neck assembly

Fuel Tank Assembly
The fuel tank consists of a moulded High Density Polyethylene (HDPE) fuel cell into which is fitted an electric fuel pump and four roll-over valves. The pump is a self priming type where the motor is immersed in fuel. The pump assembly is sealed to the tank with a rubber seal and secured in place using a coated steel locking ring. The pump also incorporates a fuel tank pressure sensor in the top flange.

NOTE: It the pump is removed, a new seal must always be fitted.

Fuel Filler Neck Assembly
The filler neck consists of a stainless steel upper section and a convolute nylon lower section. The nylon lower is joined at one end to the tank and at the other to the stainless upper section where both joints utilize a short piece of rubber hose. The joint at the fuel tank is secured using a spring assisted hose clip which has a shear off cap.

NOTE: The spring assisted clip must never be reused, if removed a new clip of the same type must be fined.

Tank vent connections are achieved using serviceable plastic quickfit connectors. The filler cap is tethered to the body of the vehicle. Only a cap of this type must be used as a replacement.

Fuel Lines
The fuel lines consist of two coated steel lines fitted along the length of the chassis from the fuel pump at the rear of the vehicle to the connections at the fuel rail on the engine, via a fuel filter on the feed line.
Connections at the pump are metal quickfits, while those at the filter and fuel rail are threaded unions utilizing O-rings for effective sealing.

NOTE: When the fuel filter is serviced or the fuel rail joints are disconnected, new "O" rings must always be fitted.

Connections at the fuel rail are made using Saginaw screw thread type connectors with O-rings as the sealing medium. The fuel lines in the engine compartment are made from a braided nylon material.

NOTE: This material must not be clamped or kinked as this impairs its performance.