what the heck are these tubes for?

[haycait911]

I am in the process of sorting out my '73 T. has been converted to carbs. these tubes come out of the center tunnel to the left of the left hand e-brake cable. when I blow in one the air comes out the other one. can anyone tell me what these are? thanks, Don.

[Jim Sims]

They're likely the lines for emissions control fuel vapor recovery system; hoses ran from the engine forward through the tunnel to the charcoal cannister in the front trunk.

[haycait911]

with that info I was able to find where they are looped at the front, charcoal cannister long gone. I'll just cap them off at the rear. thanks a bunch Jim. have I mentioned this forum rocks. Don.

[David]

One could be for the brake vacuum booster.

[DonDavis]

Originally posted by 125shifter
One could be for the brake vacuum booster.

The 73 did not have power brakes.


Those are your fuel lines. Supply and return. When you blow in one does the air from the other smell like fuel? Where are your weber fuel lines?

Interesting.

[Tyson Schmidt]

No, the first guy was correct. Those are for the evaporative emissions.

One connected to the engine shroud to force air into the charcoal cannister, and the other connected to the airbox so the engine would burn what the cannister had stored.

The cannister stores the vapors given off by the fuel tank during rest. Those hoses evacuate it when the car is running.


You might make sure that whatevevr was done to eliminate the cannister up front was done correctly, so that you don't end up with vapors in the trunk and cabin, (open) or end up sucking a vacuum on the tank during extending high rpm driving. (no vent)

[Grady Clay]

Here is what is missing from your ’73.

"
"
© Dr. Ing. h.c. F. Porsche A.G.

"
"
© Dr. Ing. h.c. F. Porsche A.G.

#5 & #6 above are in the chassis.

"
"
© Dr. Ing. h.c. F. Porsche A.G.

Note the hoses at each end of the chassis are:
Entluftungsschlatch - Vent hose 12x2.5 mm
VWN 20362.1 [Meterware[/i] – Per meter.
#20 – 1370 mm
#21 – 950 mm
#22 – 1620 mm
#23 – 1500 mm

The pipes in the chassis are steel and are part of the
chassis (no separate part number.)

Best,
Grady

[HarryD]

jm58 posted a few pictures that might help you out:

[haycait911]

thanks guys! I've tracked them to the fuel tank area to confirm they were capped and I've capped the rear to keep out the crap. Don.

[Jim Sims]

That tunnel assembvly doesn't look like it's from a '73 or one of the tubes is mislabled - there is not a brake vacuum booster on a '73 hence no brake vaccum line running forward.

[Zeke]

Originally posted by DonDavis
The 73 did not have power brakes.


Those are your fuel lines. Supply and return. When you blow in one does the air from the other smell like fuel? Where are your weber fuel lines?

Interesting.

Man, if those were fuel lines, can you just imagine the size of the carbs? Whose car is this, John Force's?