"T" (or actually "Y") fitting off of fuel tank vent line?

Danny_Ocean · 11-22-2006, 03:55 PM

My car is a '79SC. There is a plastic "T" (which looks more like a "Y") fitting halfway up the fuel tank vent line. This "T" feeds another hose which disappears under the fuse panel then exits, via a metal tube, to the inner fender. There is also a smaller hose (about the size of a vaccuum hose) which heads out and terminates under the front bumper. At either hose end, there is nothing covering them and gas fumes are escaping/accumulating under the front of the car. My (sorta) educated guess is this is remnants of a long-gone vapor recovery/charcoal cannister. Can I remove the "T" and delete these hoses?

Danny_Ocean · 11-23-2006, 05:13 AM

ttt

HarryD · 11-23-2006, 10:09 AM

It is part of your vapor revovery system. You will need a place for air to be pushed out of your tank when you fill it and to let air in when it goes down. You need to resotore this system for your heath and safety.

Do a search for vaopr recovery. Some intersting links to get you started:

1973 emision stuff

Fuel odor, front wheel well

randywebb · 11-23-2006, 10:16 AM

Removal will cause the fumes to accumulate inside your trunk - very unwise.

charcoal cannister was/is prob. in the RR of your SC

there was a plastic tank that earlier models had under the LF fender for those hoses - you need to find or fab. another one.

PS - you are gonna flunk Calif. emissions w/o it.

Also, you may engine trouble in the mtns. or desert w/o the proper emissions hose setup.

Danny_Ocean · 11-24-2006, 06:27 PM

Charcoal cannister and vapor recovery tank have apparently been removed by previous owner. Gas fumes are pumping out of one of the hoses when the car is running. I've reviewed all the diagrams, but I'm still not sure how the vapor/vent get from the front of the car to the engine compartment. Does anyone know the location of the hose I should be looking for?

randywebb · 11-24-2006, 08:30 PM

does this 1970 diagram help?

I think you need one for a 1968 car (maybe 1969)

Jim Sims once posted something about ROW cars dumping their fumes out a certain hose. I'll see if I have it saved, or you can try to pull it up w/ a search.

randywebb · 08:54 PM

Thread with a large # of diagrams that Grady posted

tank ventilation-MFI diagrams

-- but I don't really see what you need, which I suspect is to turn the car into an early config. or into a ROW type car if you want to fail emissions testing.

to Pass, you need to buy a vapor tank from a junkyard; and get a charcoal canister from VW (they make the one the 911 uses). Then hook it all up correctly.

bbh03 · 11-24-2006, 08:45 PM

My 78 ROW had the recovery tank in the LF fender. The car had no charcoal canister though. If I find I can convert the car to race w/o this tank, I can send you mine.

bbh03 · 08:48 PM

Randy, the ROW cars dump fuel vapor out a hose through to the tank in question through the LF fender right next to the hole where the lighting wires go. The system has one tank, not a separate one for expansion and vent.

randywebb · 11-24-2006, 08:48 PM

simplified system for race car - not sure if Chuck Moreland ever implemented it...
Need to vent, my gas tank

Danny_Ocean · 11-24-2006, 08:52 PM

I have no emissions testing. My car is ROW, but has been "butchered" by the previous owner. I'm not too interested in restoring this feature, just trying to figure out a way to send the fumes to the air cleaner while the car is running.

randywebb · 11-24-2006, 08:53 PM

Brian,
1. which year ROW cars?
2. You are saying there is only 1 tank and it is in the LF fender? -- i.e. there is NOT a tank up under the cowl (by the tach)? that is where the 2 tnks are on early US cars.
3. Do you know where the hose you mention originates?

bbh03 · 11-24-2006, 08:53 PM

Good link Randy, thanks.

bbh03 · 11-24-2006, 08:56 PM

Quote:

Originally posted by randywebb
Brian,
1. which year ROW cars?
2. You are saying there is only 1 tank and it is in the LF fender? -- i.e. there is NOT a tank up under the cowl (by the tach)? that is where the 2 tnks are on early US cars.
3. Do you know where the hose you mention originates?

1: Not sure, but I know 78-79 are like this.
2: Yes. No tank behind the dash.
3: It originates at the T (Y) which Danny is questioning. It terminates at the LF fender tank.

randywebb · 11-24-2006, 08:57 PM

Danny - (most early cars) have two rel. large dia. fabric covered hoses running back to the engine comp. - those carry vapors to the motor and need to be connected; they are in or near the tunnel

later cars ('75 on?) have the charcoal canister in the engine comp. and may only have one hose - I dunno

Danny_Ocean · 11-24-2006, 09:03 PM

OK, thanks. I'll look for them. There are a few hoses in my engine compartment that are disconnected (from something) and blocked off with golf tees. I also found a hose barb that was wide open on the left side of the air cleaner. I blocked it, but now believe it may be the vacuum source for the vapor recovery system. Gotta find another car and compare the two! My car is an absolute mess, thanks to the previous owner's feeble attempts @ maintenance/modification.

bbh03 · 11-24-2006, 09:07 PM

How are your brakes? The vacuum hose could be for the MC booster too.

randywebb · 11-24-2006, 09:17 PM

good luck - I wish I'd taken a pic of my evap hose system when I pulled it out of the car...

BTW if those trunk hoses are yellowing then they should all be replaced with special gasoline vapor approved tubing - not normal PVC - it will fall apart quickly.

what's the Bentley say ?? you are lucky yo ahve a car new enough to have a BEntley on it...

Danny_Ocean · 11-25-2006, 08:07 AM

Quote:

Originally posted by bbh03
How are your brakes? The vacuum hose could be for the MC booster too.

Brakes seem fine. Are they vacuum assist? It looks like a manual brake MC to me...

bbh03 · 11-25-2006, 12:49 PM

Your doesn't have a big black booster to the front of it?