breather hoses for emission system - source?

[sdmcoupe]

I'm trying piece together the emission system for a 1970 911S. I have everything except the two hoses that terminate in the engine bay. The diagram for the system lists these as 12x2.5mm (1500 and 1620mm long). Part number is apparently N-020-362-1-OEM. Pelican has these listed as no longer available.

Anyone have a source for these hoses?

[WMontald]

https://*********************.com/911-912-65-73-/Fuel-Tank/Fuel-Tank-Breather-Hose-12mm-x-17mm-70-91-p31289.html

[HaroldMHedge]

Another source would be Bel Metric.

[sdmcoupe]

Bel Metric appears to have it. Thanks!

[Tremelune]

What is the purpose of these hoses? I'd love to get rid of them...

[HarryD]

Originally Posted by Tremelune

What is the purpose of these hoses? I'd love to get rid of them...

Keeps gasoline vapors from filling your passenger compartment and helps to recapture your fuel.

Why do you want to delete? Weight savings are pretty minimal. Going on a personal diet for most of us would be more effective.

[Tremelune]

Simplicity. Mine are hard and currently not connected to anything as it is. There's gotta be a better way to prevent vapors inside the cabin than all this:

[HarryD]

Originally Posted by Tremelune

Simplicity. Mine are hard and currently not connected to anything as it is. There's gotta be a better way to prevent vapors inside the cabin than all this:

Check out this thread. You can try the 1969 system posted by Grady.

https://forums.pelicanparts.com/porsche-911-technical-forum/584831-fuel-tank-venting-system-question.html

[Tremelune]

I don't want to hijack this thread too much, but it sure seems like running a tiny hose from the tank vent line underneath to the rear bumper would pretty much do it...

[sdmcoupe]

keep hijacking. :-) Interested in where this goes.

[HarryD]

Originally Posted by Tremelune

I don't want to hijack this thread too much, but it sure seems like running a tiny hose from the tank vent line underneath to the rear bumper would pretty much do it...

Your fuel tank is in the front. Why run a long line. Vent to the front of the car.

If it was me, and wanted to minimize the setup, I would do something like the 1969 setup.

Originally Posted by Grady Clay

Here is the 1969 Evaporative Emissions System


© 1969 Dr. Ing. h.c. F. Porsche K.G.
This shows the fuel system for the 911T (pump at rear), #2, 4, 16, 17.
and
the fuel system for MFI 911E & 911S, #3, 4, 7-10, 16-19, 37-42 and more.
(In 1970, the 911T is plumbed as the 911E&S here.)





The ‘tee’ fitting (#44 above) does not show a 3rd connection here.
My recollection is that is the small vent hose to the filler neck.

The outlet goes through a grommet (#47) in the front panel behind the windshield washer reservoir.
It vents between the front bumper and the inner panel.


''' snip ''''


Best,
Grady

[Tremelune]

I just mean get rid of all those boxes and hoses. Just vent the tank to atmosphere to handle the pressure difference, and rely on the smell being behind you to solve that issue.

The '69 solution might be 80% of the ideal solution with 20% of the work, so maybe I'm going too far...

[HarryD]

Originally Posted by Tremelune

I just mean get rid of all those boxes and hoses. Just vent the tank to atmosphere to handle the pressure difference, and rely on the smell being behind you to solve that issue.

The '69 solution might be 80% of the ideal solution with 20% of the work, so maybe I'm going too far...

The little box creates a high point in the fume collection system to keep liquid fuel from exiting. I know when I autocross my car, I often see liquid in the lines from fuel sloshing around. You probably want to install the small tank.

FWIW, the smell will mostly occur when the car sits or is being fueled.

Many years ago, I had the old, hard hose fall off the top of the gas tank. The fumes were really heavy in the passenger compartment.