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I've been trying to study the evap system, as I've got a leak somewhere I need to address.
My basic understanding of the evap system is that the gas tank is connected to the charcoal canister. Activated charcoal is good at storing fuel vapor. Effectively the tank is vented through the charcoal canister to atmosphere. These collected vapors need to be purged occasionally. The canister is connected to the intake manifold. Under correct operating conditions (manifold vacuum, among other things), the regeneration valve opens to draw in fuel vapor that has accumulated in the charcoal.
Canister purge valve closes which seals the system to atmosphere. Regeneration valve opens, and and the intake vacuum draws vapors out of the canister.
When the system wants to test itself for leaks, it will close the canister purge valve which should seal the system, open the regen valve to draw vacuum, then close the regen valve. Now it sees how long the system will hold vacuum. Based on this, it can set a code for small/large leak
So knowing what I know, I believe the lines are as follows
A goes back to the regeneration valve under the intake manifold, and connected to the AOS fitting.
B connects the tank to the canister.
C is how the canister is vented to atmosphere (controlled by valve G)
D Some kind of fuel vapor recovery or fuel vent valve when fueling controlled by valve F. My guess is that during refueling, valve F opens and G shuts so vapor goes from the filler into the canister and not the atmosphere.
E is open to atmosphere somewhere
F is the "fuel tank vapor control valve"
G is the "purge valve for fuel vapor canister"
Can anyone confirm if I have this correct?
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