79' emission question

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Apr 30, 2002 | 03:12 PM

jerryjfunk

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Melting Slicks

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From: Pittsburgh PA

79' emission question

My engine is out, and I'm cleaning everything up, getting rid of the bubbafied vaccum hose routing, etc. I was looking at the canister under the driver side fender, and it looks like the emission routing is all wrong. I'm going to get rid of all that, but I don't know exactly how. Do I just plug the hoses coming out of it, or do I have to do something else?
:confused:
Thanks,
Jerry

Apr 30, 2002 | 03:53 PM

bigvette1

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From: Schaumburg IL

Re: 79' emission question (jerryjfunk)

Jerry, I guess the question is why? The evaporative cannister (when clean and clean filter) is in line with the PCV valve and works fine to route fuel and crankcase fumes back to the intake. Otherwise you have too high of pressures in the tank and in the engine. Check out you rlocal emission laws and testing procedures before you do anything. Even on a rolling 25 year exemption you have until 2004 or 2005.

Apr 30, 2002 | 04:04 PM

jerryjfunk

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From: Pittsburgh PA

Re: 79' emission question (bigvette1)

Well, I'm going to be using a non-emmissions carb and intake, so I imagine much of this stuff isn't going to hook up. Is there anyone who has done this on a 79'?

Thanks,
Jerry

Apr 30, 2002 | 04:43 PM

79Corvette02

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From: Paradise City

Re: 79' emission question (jerryjfunk)

Hahahah. The answer is yes. It's all gone! My engine bay is devoid of most accesories (including AC compressor!). Whether this is legal or um....good for the environment, I'm not sure. I've still managed to "pass" inspection, but I'm sure Mother Nature isn't too happy with me. I'll email you pics of my engine bay in a day or two after I take some close ups.

Apr 30, 2002 | 04:55 PM

Justin79-L-82

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From: WInnipeg Mb

Re: 79' emission question (79Corvette02)

can you e-mail me those pictures too when you get them? :D Thanks

Apr 30, 2002 | 05:16 PM

Tom73

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From: NM

Re: 79' emission question (jerryjfunk)

My concern with removing that canister would be gas fumes in the garage. With nothing to collect them it could get to be very foul smelling in there. :D

tom...

May 1, 2002 | 01:34 AM

jerryjfunk

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Melting Slicks

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From: Pittsburgh PA

Re: 79' emission question (79Corvette02)

Yeah, that's my deal. I know I can "pass" inspections around here easily. So since you just got rid of the cannister, what did you do with the return line from your tank? Does it empty out the back, or do you still have the line that goes up front? Is it plugged or does it empty out?

Pics would be great, thank you! :cheers:

Jerry

May 1, 2002 | 02:07 PM

Marv

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From: Omaha, NE

Re: 79' emission question (jerryjfunk)

Jerry-

I'd say keep it. The vapors stored in the canister purge valve are pulled into the carb though the same port as the PVC vapors-just tee into the PVC hose. There are two vacuum valves in that cannister and they are "flip-flop"-when vacuum is present with engine running the cannister purge valve opens and releases the stored vapor. The other valve is closed with vacuum present and it is the one that has a vapor hose connected to the bowl vent on the stock Quadrajet to capture those vapors when the engine is not running. If you don't have a bowl vent you could safely plug this line with no harm. As others have said, IF you plug the line from your fuel tank you will have gas vapor blown out through the fuel cap pressure release valve. Be aware that this may shorten the life of your fuel tank bladder inside your tank. Those 78-82 tanks will not likely ever be made in repro due to legal issues so I wouldn't abuse it by repeatedly pressurizing it. Good luck.

Marv-