Weber w/ vapor vent line to gas tank?

[kanurys]

I'm doing a weber swap on my 1987 GL, ea82. Can I remove the charcoal canister and hook the fuel tank vent line directly to the vapor recovery port on my weber? It would be nice to have filtered air going in that return vent line and the extra vapors as well as be a little more protected from water getting to the vent line.

 

Will this effect the performance of the carb or is the amount of air going back in the vent line negligible?

 

Is there a safety hazard with venting vapors back into the gas tank?

 

Do I need some sort of check valve letting flow go into the tank but not back?

 

Thanks,

 

Sesh

 

Edited March 4, 2010 by kanurys

[naru]

Not a good idea.

 

Carb vent needs to see atmospheric pressure in order to maintain proper pressure differential between the air above the fuel in the float bowl and the main discharge in the venturi.This pressure difference determines how much fuel is delivered.

 

Tank vent line will see both + and - pressure.

 

If you must remove the cannister,vent both lines to atmosphere.

[kanurys]

10/4, thanks. That is exactly what I was thinking, but I don't fully understand the canister hook-up and how to properly actuate the purge valve. Maybe actuate it's purge off of the same as the egr vac line from the carb?

 

Oh well. Back to plan A: pull charcoal canister, vent tank somewhere inside engine bay and leave weber vapor recovery open. Kill trees and breathe fumes.

 

Just out of curiosity, is anybody running a charcoal canister with their weber and would be willing to tell us how it's all plumbed in?

 

Sesh

[kanurys]

Here is a diagram I found on another forum. It's not a Subaru, but I assume the system is similar. I still think it would be a good idea to purge the charcoal canister when the EGR is also activated, instead of the timing vac advance.