What is this ???

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Apr 7, 2014 | 11:35 AM

1978vett

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Racer

Joined: Jul 2013

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What is this ???

I have been trying to figure out thr vac ports on my carb and discovered this hose .. It isnt connected to anything .. It comes up from under the drivers side fender... Does any one know what it is and exactly where it needs to be connected ?? Thanks for your help ..

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Apr 7, 2014 | 11:48 AM

MelWff

Race Director

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looks like it should run to the vacuum advance on the distribtuor

http://willcoxcorvette.com/product_i...3aac4b8f411f38

Apr 7, 2014 | 11:54 AM

1978vett

Thread Starter

Racer

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Quote:

Originally Posted by MelWff

looks like it should run to the vacuum advance on the distribtuor

http://willcoxcorvette.com/product_i...3aac4b8f411f38

Thanks for your reply,, This hose runs down under the fender on the driver side,, it is connected to something under there,, I'm trying to figure out what it's connected to under there and what the other end needs to be connected to... The vac advance is already connected...

Apr 7, 2014 | 12:00 PM

maverickmk

Drifting

Joined: Jun 2013

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From: Cocoa FL

I think it's this canister.

Apr 7, 2014 | 12:22 PM

Easy Mike

Team Owner

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From: Southbound

Cruise-In II Veteran

Apr 7, 2014 | 12:34 PM

BKarol

Melting Slicks

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From: Northeast

The top of the canister on a 78 looks like this (other years are different)

Apr 7, 2014 | 12:42 PM

1978vett

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Racer

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Quote:

Originally Posted by karol

The top of the canister on a 78 looks like this (other years are different)

I'm not sure what that is but that is where the hose runs to and its connected to the top port on the left ...,, The other end is not connected to any thing ... Heres another picture that shows the pcv conections..

Apr 7, 2014 | 01:19 PM

1978vett

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Racer

Joined: Jul 2013

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Quote:

Originally Posted by 1978vett

I guess I just need to know where to connect the end thats not connected... Does it the fuel vapor canister need manifold vacuum or port vacuum ? Thanks for all of your replies..

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Apr 7, 2014 | 01:44 PM

qwank

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Joined: Feb 2011

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From: Southern NH

mine connects to the elbow on the air cleaner housing

Apr 7, 2014 | 02:34 PM

#10

1978vett

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Racer

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Quote:

Originally Posted by qwank

mine connects to the elbow on the air cleaner housing

Thanks for the reply,, it says control vacuum tube on my canister,so I guess that would be connected to ported Vac on the carb ??

Apr 7, 2014 | 04:12 PM

#11

1978vett

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Racer

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Thanks everyone for the replies,, it really helps a lot...

Apr 7, 2014 | 04:13 PM

#12

qwank

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From: Southern NH

I don't know, you don't have that elbow on your air cleaner? I'm thinking it sucks the fumes into the engine from the air cleaner and burns them.

Apr 7, 2014 | 04:19 PM

#13

1978vett

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Racer

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Quote:

Originally Posted by qwank

I don't know, you don't have that elbow on your air cleaner? I'm thinking it sucks the fumes into the engine from the air cleaner and burns them.

I'm not sure either,,,, it says controled vacuum on the end that is connected to the canister,,, not sure but i'm kind of thinking it might mean that it should connect to ported vacuum on the carb..Just guessing though,, thanks for your reply

Apr 8, 2014 | 03:38 PM

#14

dembo

Burning Brakes

Joined: May 2007

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From: Lokeren, Belgium

Isn't it supposed to go to the TVS switch (blue thing) installed in the waterneck?
The canister is supposed to vent when the engine is at operating temp

Apr 8, 2014 | 04:01 PM

#15

1978vett

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Racer

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Quote:

Originally Posted by dembo

Isn't it supposed to go to the TVS switch (blue thing) installed in the waterneck?
The canister is supposed to vent when the engine is at operating temp

On my 78 the egr valve is connected to the TVS switch ,,the switch is connected to port vac on the carb.. My TVS is in the intake manifold. Thanks for your reply ..

Apr 8, 2014 | 04:27 PM

#16

dembo

Burning Brakes

Joined: May 2007

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From: Lokeren, Belgium

This might help? There's more then one TVS switch.
Willcox page

Apr 8, 2014 | 05:00 PM

#17

1978vett

Thread Starter

Racer

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Quote:

Originally Posted by dembo

This might help? There's more then one TVS switch.
Willcox page

Thats a good diagram,,, it looks more like what I have.. My EFE switch is in the same place as the one in the diagram.. It isn't hooked up to anything because someone had removed all of that when they installed headers on it.. Thanks for posting that..