Evaporative Emissions Systems

Delphi Evaporative Emissions Canisters

Delphi Evaporative Emission Canisters help limit the amount of gasoline vapors normally created by fuel storage and fuel delivery from being released into the environment through an on-going process of adsorption and purging.

During adsorption, hydrogen molecules in gasoline vapors from the fuel tank enter the canister through a tank tube and are attracted to and stored on the surfaces of the carbon bed inside the canister. In purging, the manifold vacuum draws fresh air through the carbon bed, pulling the gaseous molecules into the intake manifold for combustion.

Delphi recognizes that a carbon canister is an integral part of an effective evaporative control system. Delphi develops evaporative emissions canisters tailored to specific customer needs. Delphi has an extensive portfolio of canister designs to meet any packaging objective. Delphi offers a range of products to help manufacturers meet a variety of adsorption level requirements for specific engine programs, fuel tank sizes, and emission regulations.


  • Delphi's integrated canister modules feature optimized sizing, flexible mounting, and compact packaging to meet vehicle space requirements
  • The canister modules also provide low restriction, canister vent solenoids (CVS), and dust filter content to reduce vehicle system connections
  • Delphi's LEV III canisters feature additional integrated components including a hydrocarbon scrubber
Feature Emissions Application
Emissions Application
Emissions Application
Emissions Application
Emissions Application

Partitioned carbon bed


Increases efficiency by reducing hydrocarbon migration toward the air tube vent

Liquid trap


Helps prevent condensation from contaminating carbon in liquid state

Active liquid trap purge (optional)


Purges liquid fuel from the liquid trap area

Volume compensation



Prevents loss of carbon pack with exposure to moisture, alcohol fuels, and excessive temperatures (300,000 mile [480,000 km] durability)

Flexible mounting and packaging with multiple orientations  •

Enhances packaging capabilities

Multi-chambered design


Reduces bleed emissions and further inhibits hydrocarbon migration toward the air inlet

Hydrocarbon scrubber
       • Captures low levels of canister bleed emissions and provides deep efficient cleaning with available purge*

Delphi provides integrated and discrete solutions with hydrocarbon scrubber

Impact modified nylon shell material (optional)  • Provides resistance to stone impact and significantly reduces warranty claims due to breakage

*Bleed emissions less than 20 mg on 2- and 3-day test

Typical Applications

Delphi offers carbon canisters that can help automotive manufacturers around the world meet all gasoline evaporative emissions standards including:

  • North America, such as Low Emission Vehicle (LEV II/III)
  • European (Euro) Standards
  • Korean Low Emission Vehicle (KLEV)

Delphi also offers evaporative emissions canisters for specialized automotive applications including hybrid vehicles, gasoline direct injection (GDi) programs, and alternative fuel programs.

Delphi can help manufacturers of non-automotive gasoline engine products meet anticipated evaporative emissions regulatory standards. Delphi offers its unique expertise and complete technical support for:

  • Motorcycles
  • Marine engines
  • Small gasoline engine products such as lawn tractors and stationary generators

Performance Advantages

Delphi's ability to integrate components in one canister module provides manufacturers with simplified canister designs and greater packaging flexibility. Delphi can provide an evaporative emissions canister or design and build a complete evaporative emissions system, including:

  • Carbon canister
  • Hydrocarbon scrubber
  • Hoses
  • Mounting
  • Hybrid valves

Delphi employs an exhaustive analysis, testing, and validation process to verify that an evaporative emissions canister will work properly. Additionally, Delphi can also customize testing for all emission requirements.

The Delphi Advantage

Delphi is one of the world's leading manufacturers of evaporative emission canisters, producing millions annually and providing customers with world class quality and warranty performance. Delphi offers the benefits of more than 35 years' experience, and the in-depth knowledge of evaporative emissions canister design and market requirements. Delphi offers low-cost manufacturing in North America, Asia, and Europe. Delphi has full engineering capabilities in North America and Europe to help manufacturers meet evolving evaporative emissions criteria.

As a global leader in engine management systems technology, Delphi can help manufacturers around the world meet emissions requirements, improve fuel economy and enhance performance. Delphi is a source for high value solutions and our systems expertise is built into every product. Delphi's flexible engineering approach encourages collaboration. And, Delphi has a thorough understanding of automotive markets around the world and a global network of resources.