[67MercCat]

Hey guys I just got a 73 Nova i'm working on and I noticed that there's two lines coming from the fuel tank. One leads to the mechanical fuel pump and the other leads to a spot right beneath the brake booster, but it's not connected to anything. I capped it off for now to spot junk from getting in there but what is that all about, anybody know? The engine is 327, carburated.
thanks

[cobalt327]

Originally Posted by 67MercCat

Hey guys I just got a 73 Nova i'm working on and I noticed that there's two lines coming from the fuel tank. One leads to the mechanical fuel pump and the other leads to a spot right beneath the brake booster, but it's not connected to anything. I capped it off for now to spot junk from getting in there but what is that all about, anybody know? The engine is 327, carburated.
thanks

IIRC originally it went to the charcoal evaporation/emissions canister.

Found a drawing, click on it for more info:

[67MercCat]

thx man, I guess i dont need it and I can cap it off, I dont see a charcoal evaporation/emissions canister anywhere in the engine bay. I figured it was thrown away quite some time ago. I dont suppose it would affect anything now would it?

[S10 Racer]

I think those were used before vented gas caps came about. If you have a vented gas cap, you may be ok. The tank has to be vented someway.

[67MercCat]

Ah ok, I'm going to go ahead and check the cap and make my determination from there.

Also as far as electrical goes, all I have to hook up is the Alternator, Starter, coil and distributor wires to get it going. The wires are all there and I dont think theres anything else to it with such a simple system. I'm trying to get it rolling today.

[cobalt327]

Originally Posted by S10 Racer

I think those were used before vented gas caps came about. If you have a vented gas cap, you may be ok. The tank has to be vented someway.

That's right, you can see in the last diagram it provides a means for venting the tank. In another car I used a fuel filter, pointing downward in a protected area inside the fender to protect it from water, etc. to serve as a vent because I didn't trust the gas cap alone would have enough flow to keep up w/the fuel flow out of the tank along w/the changes in tank pressure from temperature.