what is this
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Charcoal canister for evaporative emissions. On every emissions-era Ford I've owned, half the evaporative system has been missing. For that reason, I've always removed the remnants, but left the vent line from the tank running up to the canister to serve as the vent. So no, you don't necessarily "need" it, but mind the line coming from the tank.
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