Note: All Fiero uses Same EVAP system and "can."
Floss/Foam Filter only blocks big crap getting into the carbon inside.
Filters look like above likely has carbon problems and the "can" doesn't do much or is "dead."
Fram and some others make/made a filter that fits exactly but need to be bit careful installing w/o punching a hole in "screen" keeping carbon in.
Filter after stuffing edges under the "rim" should fill every space.
Don't cut them down until you try to install first and way too big.
Many old filters here have wear or shrink or was replace before wrong and may not fit right so don't trust them.Carbon Dies? Why?
Some reason why but big one is If EVAP "Can" gets wet inside w/ fuel or polluted water, Carbon is "dead" and won't work even if "dries out" after.
You can't buy new "Cans" for Fiero and many other old cars.
Might replace the Carbon but many "Cans" are Sealed by Sonic Welding etc so can't replace the carbon easy.
Active Carbon isn't like other types and must be close to same size as OE.
Replace options assumes if valve etc at top of Fiero "cans" are good.
Note that Fiero and some others Bracket to hold the "can" has a metal Shield to protect the bottom.
Problem w/ that...
Crap builds up there often holding wet crap against the bottom.
Metal rusted and shield is gone.
The shield has openings to drain water but the big open side faces the fender and noise insulation and often that area holds a lot of crap.
Has a "notch" too but easy to block it w/ crap from falling down/in fender opening.
------------------Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)The Ogre's Fiero Cave
[This message has been edited by theogre (edited 09-06-2021).]