Follow the vapor, then the evidence
The purge/seal lesson connects three roles: the canister holds fuel vapor, purge connects the vapor path to the engine, and the vent lets the system breathe through the canister. Pressure feedback helps the controller evaluate the system. Other EVAP arrangements use different monitoring hardware, so identify the system before transferring a test.
| Part in this explanation | Question it helps answer |
|---|---|
| Canister | Where is vapor stored before purge? |
| Purge path | How does stored vapor reach the engine? |
| Vent path | How can the system breathe, and when is it sealed? |
| Pressure feedback | Does the measured response agree with the system state? |
Did this help you move forward?
Optional. No written response is collected.
Watch the source in context
Video loads only when you choose to play.
Did this help you move forward?
Optional. No written response is collected.
Sources, review and limits
Prepared by GoTech with AI assistance. Source wording and the bounded educational interpretation were checked in two reasoning passes by the same assistant. Technician review is pending; vehicle-specific service information and visual details have not been independently verified. Original source files remain unchanged.
- Follow the vapor, then the evidence
- Purge/seal training concept; no claim of universal system layout or vehicle coverage. Watch the source · 7:00
About older links to this guide
This guide has been rewritten around the available source evidence. An older section link may land here; use “In this guide” above to find the revised explanation. Original source files are retained in GoTech’s review history.