Charcoal canister question

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Jun 6, 2010 | 03:58 PM

z10kl

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Racer

Joined: Feb 2007

Posts: 494

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From: Denver nc

Charcoal canister question

I know what it does, but why two hoses to the carb? One to the pcv valve to carb and another to the carb. Aren't both pulling vacume?

Jun 6, 2010 | 04:25 PM

budavid

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Joined: Nov 2007

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From: Manama

see the picture below, it will be clear when you see how it works

as far as I think you don't have the line on the left on the canister.

the purge signal will allow the canister to start "sucking" fuel vapor through the other vacuum line as you don't want it to escape when the engine is off.

I'm not a pro, but this is what I understand..

P.S you don't have the bowl vapor line I guess.

and the one Tee'd to the PCV is the one which sucks the fuel vapor, the smaller one should be the purge signal, without it the vapor should remain in the canister.

cheers.

Last edited by budavid; Jun 6, 2010 at 04:29 PM. Reason: to clarify the carburetor routing

Jun 6, 2010 | 04:29 PM

Alan 71

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Joined: Sep 2006

Posts: 31,235

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From: Westminster Maryland

Hi B,
Very nice schematic!
I don't think I've ever seen it.... where's it from?
On my 71 there are 3 lines.... 1 entering from the gas tank, 1 entering from the carburetor, and 1 leaving the canister headed toward the pcv and the carburetor.
Regards,
Alan

Last edited by Alan 71; Jun 6, 2010 at 04:35 PM.