Charcoal Filter - Do You Really Need it? Options

[kbrunk1]

I am bringing back a 73 2.0L Djetronic 914 with the Charcoal canister beside the gas tank. I am also relocating the fuel pump below the gas tank.

Do you really need the charcoal filter?
Also the gas vapor gas / expansion tank also seems worthless.

Anyone an expert on this subject? Can you just plug some of these vapor lines and not effect the engine running? I think emissions are exempt on this year car.

I would like to make this as simple as possible.

Thanks

[FourBlades]

All these parts keep the smell of gas out of your cabin.

If you have them then I would use them.

John

[dlestep]

The expansion tank should remain, with new hoses.
You can relocate the charcoal canister to the driverside inner fender (where the
914-6 oil tank lives). the two black plastic lines run from the tank to the engine
bay. One line connects to the fan housing, pressurizing the flow of the ELS.
The other one returns to the engine bay and is connected to induction.
You can cut the stock lines allowing the relocation.
Do not forget to use the filler neck hose to route overflow below the floor and
underneath the car.
There are schematics of the evaporative loss system for your car, here and
elsewhere on internet that you can use as an example.
Without the ELS lines, you WILL smell gas, especially in the heat of the day.

There are other ways, such as dry sumping carbs, and routing scavage lines
from the expansion tank via check valves to the exhaust bungs.
(You must NOT draw directly from the tank!).

[Millerwelds]

I removed them to clean things up as well. The gas smell in the cabin got to be too much. So I put them back on and (self induced) problem solved.

[Rand]

Can you just plug some of these vapor lines and not effect the engine running?

Yes, has nothing to do with the way the engine runs. You'll piss off some environmentalists. If you don't route new vent lines from the tank properly you'll smell gas fumes. (IMG:style_emoticons/default/popcorn[1].gif)

[iamchappy]

I removed it and routed the line back to the air filter. No cabin smell.

[Rand]

Ding! A nice example of routing lines nicely.
Who still wants wants bpharffly tanks and lines and entanglements? (IMG:style_emoticons/default/biggrin.gif)
Keep r Clean

[McMark]

I don't get removing it, especially from a 73 where it's up front and out of the way. It weighs nothing, it's not in the way, and it serves a function... What's the downside?

[zonedoubt]

And refill the canister with fresh charcoal. The original charcoal doesn't last forever. I believe the service manual recommends replacement every 50,000 miles.

[IronHillRestorations]

Little to no downside for taking off. Pretty much all the cars I've been in with it off, have a fuel smell. Do you need fuel vapors in your air?

[sixerdon]

My experience says they are not needed. I've said this before that the majority of /6's didn't come with a filter unless it was for the CA market, although they do have the expansion tank. Why they have the expansion tank, I haven't a clue as it is vented underneath the car to the atmosphere and serves no real purpose. I have no issues with vapors. Even the webers vent to the atmosphere when the car is sitting. No smell and my car is factory stock.
Here's a thread where the tank was discussed before.

http://www.914world.com/bbs2/index.php?sho...expansion++tank

And here is a thread where an early /4 never had a filter, but did have the tank vented to under the car. Purely stock.

http://www.914world.com/bbs2/index.php?sho...72277&st=60

So, not all /4's came with a filter and the tank was vented by tube to underneath the car. Likewise with most /6's.

Don

[sixerdon]

More filter discussion here.......

http://www.914world.com/bbs2/index.php?sho...108524&st=0

Don

[wndsnd]

If you go fro fi to carbs, how does it tie in. I thought it was vented through the fi vacuum some how.

[Pat Garvey]

Guess I'm wierd. Replaced mine at 50K miles, per the factory specs. Let's see, that was 1976 I think. Works! Think it was about a $40 part then. No stink to this day.

[914werke]

On early cars so equipped the canisters were pretty much sealed so replacement was your only option. On later cars they used a plastic cased canister which the top could be removed so you could replace the pellets with new.

[Vysoc]

Hello World,

I just got in a big fight with my wife on Saturday night after watching the Truck race and coming in from the garage. You smell like gas go take a shower! Why can't you stop the smell of fumes coming from that car. I have my charcoal canisister back in the engine compartment (75) and I am sure either the canister or the charcoal need to be replaced. I guess that will be the next step, I did'nt really have the heart to tell her that the six project with carbs will probably smell worse?

Are the charcoal pellets available at auto parts stores? Or I have the older style round canister which you cannot get into, is there a place to buy the style cannister that you can replace the pellets?

Vysoc (IMG:style_emoticons/default/flag.gif)

[Vysoc]

Answered my own question,

I just bought a brand new canister that fit the 911 / 924 & 914's same one shown in the other fuel vapor thread, it is a Porsche part NOS and was only $35.00. Found it on E-Bay, now where are the pellets available?

Thanks, Hope this works, I don't even smell the gas anymore.

Vysoc (IMG:style_emoticons/default/flag.gif)

[zonedoubt]

...now where are the pellets available?

I posted this before: http://www.914world.com/bbs2/index.php?s=&...t&p=1602189

[Vysoc]

Thanks Zonedoubt,

Thanks for the info, was unsure if Aquarium Pellets would take care of the fuel vapors. They are readily available and easy to acquire.

Thanks for the great info!!!

Vysoc (IMG:style_emoticons/default/flag.gif)

[ruby914]

I took the trouble of getting the charcoal canister, check valves and all that for my WRX914.
They are not all in yet.
You inspire me to get back to it.
I love the smell of a 2 stroke dirt bike track in the morning but the WRX all day is different.
It will feel better running cleaner too.