The expansion tank: Gas Tank vent line to Expansion Tank lower port. Expansion Tank upper port to Charcoal Canister (where the 84's gas tank's vent line went.).
I just did this swap. I use Dorman 578-125 Fuel Tank Strap off e-bay (sold in sets only). I have a spare,send me a PM if interested. The pivot pin is bigger and needed to be cut to the width OEM Fiero strap.Even though the pivot pin is thicker, it will fit with some slight modifications (angle grinder and cut off wheels required). I moved the OEM strap "rear" to the front of the new tank. I had to cut that down slightly and drill a new hole. When ready to install, the tank went in so much easyer if you tamp the edges slightly all the way around.
I have brand new FS SS straps for the 84-86. I may reuse one of the straps and make a new one for the back, or get two new ones from FS and re-sell these.
I'm repainting the bottom of the car now, so I'm not in any particular hurry.
Let me know if you change your mind. Its brand new. I got 2, when I baught the tank strap. I used one and have no need for an extra tank strap (its for the rear tank).
Originally posted by Patrick: I also wonder if its elevation (relative to the fuel tank and/or the overflow tank) might now be an issue in its new location?
No, Above pic EVAP Canister on frame is not ideal. Does Expansion Tank help that? No clue.
Main difference old vs new tanks is GM redesigned tank's fill and vent tubing. That mean GM's new design has less "air" space when full. The solution move air space to another tank thus the Expansion Tank.
Expansion Tank give more buffer space w/ bigger tank... Full tank + Weather temp changes + fuel is fuel pump coolant + return flow (Especially port injectors setup) etc. mean more heat to tank. Liquid fuel can expand plenty when weather/car heats fuel 30° or more. Much better to have more buffer space to prevent the tank from pushing liquid fuel to the Canister...
If liquid fuel go up the tank's vent line then Will poison the Evap can. You hope all you need to replace the Canister. problem here is Canister mount low on frame can siphon whatever fuel. Likely won't empty the tank but enough to be dangerous. The pic also show Exhaust under EVAP Canister... Exhaust heat could damage the plastic Canister. If you leak fuel on exhaust pipe(s)...
------------------ 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)
Bob, I'm curious why you relocated the EVAP canister?
I also wonder if its elevation (relative to the fuel tank and/or the overflow tank) might now be an issue in its new location?
I moved it because the location on the 84 was in a lousy spot in the engine compartment. With the 4.0 and trans, it's a bit full. I'll re-evaluate the extra drop in height, but unless the overflow fills to the top, it shouldn't siphon. As it was, it would still be lower than the overflow. Where is the 88 canister located?
Bob, I'm curious why you relocated the EVAP canister?
I also wonder if its elevation (relative to the fuel tank and/or the overflow tank) might now be an issue in its new location?
I moved it because the location on the 84 was in a lousy spot in the engine compartment. With the 4.0 and trans, it's a bit full. I'll re-evaluate the extra drop in height, but unless the overflow fills to the top, it shouldn't siphon. As it was, it would still be lower than the overflow. Where is the 88 canister located?
I haven't got a picture of my own handy, but have you not seen an engine bay of an unmolested Fiero? The EVAP canister is in the same place on the driver's side on all of 'em.
I haven't got a picture of my own handy, but have you not seen an engine bay of an unmolested Fiero? The EVAP canister is in the same place on the driver's side on all of 'em.
I molested my Fiero about 8 years ago. Haven't really paid attention to the EVAP since...
Thanks for the pic...
Bob
P.S. Isn't the vacuum line missing from the purge valve?
[This message has been edited by RCR (edited 10-01-2013).]
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