Description And Operation: Overview

WARNING: This page is about a different car, the 2018 Jaguar XF, 2017 Jaguar XF, and 2016 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

The Evaporative Emission (EVAP) control system reduces the level of hydrocarbons released into the atmosphere by fuel vapor venting from the fuel tank. The system comprises an evaporative emissions canister, purge valve and interconnecting vent pipes and hoses.

Fuel vapor is generated by the fuel in the tank and the amount of vapor produced increases as the fuel heats up. Fuel vapor can flow freely to the evaporative emissions canister via the tank venting system. The venting system consists of a Fuel Limit Vent Valve (FLVV) and a roll-over valve installed in the fuel tank. The re-fueling breather pipe connects from the fuel tank breather stub to the top of the fuel filler pipe, and the fuel tank ventilation pipe connects from the ventilation stub to the evaporative emissions canister.

The vapor from the fuel tank passes into the evaporative emissions canister where it is absorbed and stored by the charcoal. Because there is a limit to the amount of vapor the canister can contain, the fuel vapor is purged from the canister when the engine is running and burned in the engine during the combustion cycle.

The vapor generated in the fuel tank during re-fuelling, flows without restriction into the evaporative emissions canister.