Originally Posted by
BrianDguy
The function of the canister is to store vapor to be used by the engine at a later time. The function of the purge solenoid is to allow the engine to use the vapor when told too by the computer. They cannot be bypassed in the manner you speak because engine vacuum would create negative pressure in the tank, and suck raw fuel into the engine.
Thank you for the simple & direct explanation. Rep point 4 you.
I did not know [or realize, because it seems an obvious problem] that the engine vacuum would cause that to happen.