Venting gas tank

S8n · Post by **S8n** » Sun Feb 19, 2006 8:18 pm

How is everyone venting your gas tank? Are you keeping the stock charcoal canister and lines or doing something else? I really don't want a charcoal canister in my engine bay, but I do need a way practical way for the tank to vent. Suggestions? Thanks.

whipped · Post by **whipped** » Sun Feb 19, 2006 8:31 pm

I ditched the can, and put on a carb fuel filter just to prevent crap from entering the line... It sucks though, after fillup, the garage smells like gas for a week. I'm thinking about reinstalling it.

jstillwell · Post by **jstillwell** » Sun Feb 19, 2006 8:40 pm

Can't mess with that stuff in Cali. Other then cleaning up the engine bay, why would you want to? Just curious.

crzyone · Post by **crzyone** » Sun Feb 19, 2006 8:52 pm

My ecu doesn't support emissions equipment.

I plugged the line at the tank and have a vented gas cap.

whipped · Post by **whipped** » Sun Feb 19, 2006 9:02 pm

jstillwell wrote:Other then cleaning up the engine bay, why would you want to? Just curious.

exactly, and more space.

crzyone, have you actually filled the car up since you installed the vented cap? :la:

crzyone · Post by **crzyone** » Sun Feb 19, 2006 9:05 pm

I haven't filled it up for a whole year and I still have 3/4 of a tank hehe

whipped · Post by **whipped** » Sun Feb 19, 2006 9:06 pm

yeah... let me know if your garage smells like gas after you fill it up. And you WILL fill it up, probably several times, during tuning. Most of the gas will be wasted warming the thing up.

S8n · Post by **S8n** » Sun Feb 19, 2006 9:08 pm

crzyone wrote:My ecu doesn't support emissions equipment.

I plugged the line at the tank and have a vented gas cap.

Do you know at what pressure it opens at? That's probably my best (easiest) option...

crzyone · Post by **crzyone** » Sun Feb 19, 2006 9:08 pm

I think I am going to pull a fuel line and drain the tank with the fuel pump and add some new gas. This ond stuff can't be good for it.

S8n · Post by **S8n** » Sun Feb 19, 2006 9:10 pm

jstillwell wrote:Can't mess with that stuff in Cali. Other then cleaning up the engine bay, why would you want to? Just curious.

Exactly. Need to make the engine bay purty. Removing all unneccessary lines, brackets, emissions crap, etc.. then going to POR 15 the entire bay.

jstillwell · Post by **jstillwell** » Sun Feb 19, 2006 9:27 pm

Can you just relocate it to a less visable area, say inside the fender?

S8n · Post by **S8n** » Sun Feb 19, 2006 9:44 pm

jstillwell wrote:Can you just relocate it to a less visable area, say inside the fender?

Probably. I'm still trying to figure out what all the emissions crap is on this car....What's the container in the ps rear wheel area?

JamesCurtis · Post by **JamesCurtis** » Mon Feb 20, 2006 12:07 am

That's the expansion tank that came with 87-88 fiero's, something about it allowed them to up the fuel capacity a gallon or two because of it, but I'm not sure how they came to the conclusion. Someone else will probly fill you in on the details :thumbleft:

Sinister Fiero · Post by **Sinister Fiero** » Mon Feb 20, 2006 12:13 am

The charcoal canister is designed to "store" fuel vapors whenever the engine is not running. The EVAP system is designed to PURGE the canister at part-throttle while the engine is running.

If your ECU doesn't support an EVAP purge solenoid control function, not to worry. The stock Fiero 2.8 didn't use a purge solenoid. Instead, it used a ported vacuum signal from the engine to "activate" EVAP purge flow.

To make this work, all you need to do is find a ported vacuum source on your engine; something that doesn't get vacuum until the throttle is cracked. Then all you need to do is hook this ported vacuum source up to the small diaphram valve port on the canister. The other large port on the can that doesn't get hooked to the tank vent line can go straight to a manifold vacuum source. That little diaphram valve on the top of the canister will not allow ANY purge flow until it "sees" vacuum; that is how it is controlled on the 2.8 and 2.5.

You can relocate your canister to inside the fender area if you want to clean up the engine compartment. Mount it as high as possible and in as dry location as possible.

The Dark Side of Will · Tue Feb 21, 2006 1:21 pm

JamesCurtis wrote:That's the expansion tank that came with 87-88 fiero's, something about it allowed them to up the fuel capacity a gallon or two because of it, but I'm not sure how they came to the conclusion. Someone else will probly fill you in on the details :thumbleft:

The tank needs to have room for the fuel to expand as temp changes. By moving that room into the fender, they could increase tank capacity.

I'd seen that on my '87, but didn't know that it wasn't on the early cars...

S8n · Post by **S8n** » Tue Feb 21, 2006 9:13 pm

Then I guess I should leave it then, huh? So the charcoal canister can be completely vacuum operated then....I'll see where I can mount it. Thanks for the help!

Kohburn · Post by **Kohburn** » Wed Feb 22, 2006 7:23 am

S8n wrote:Then I guess I should leave it then, huh? So the charcoal canister can be completely vacuum operated then....I'll see where I can mount it. Thanks for the help!

mine is even mounted sideways with no ill effects - it just opens when the engine is running and vents the fumes to the quarter panel area where the air filter is drawing from.

(the engine looks very different now but the canister is still in the same place, far left)