Another “what is this” post from me - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Funstuie · 05-26-2019, 09:14 PM

Hey all

Quick one. Doing some upgrades and clean up on the 76 c19 today I discovered that this canister is not connected to anything. The hose gonna to the engine is just hanging there not connected and the hose going down is split open next to the radiator. So with no fear of looking stupid my question is, what is it?

Thanks

**jocko** · 05-26-2019, 09:19 PM

fuel vapor canister - part of emissions system.

Funstuie · 05-26-2019, 09:20 PM

Quote:

Originally Posted by jocko

fuel vapor canister

Thanks. Is it an issue not being connected to anything?

**TKCR** · 05-26-2019, 09:24 PM

Quote:

Originally Posted by Funstuie

Thanks. Is it an issue not being connected to anything?

No, a lot of people take them out anyways. Cleans up the engine room. Odd place for it though. It usually mounted low, in the front of the engine room.

franken · 05-27-2019, 12:23 AM

Those are used to make fuel vapor get sucked into the engine and burned. The system uses a nonvented gas cap so one way or another, the tank is being vented if the system isn't working. It's pretty simple to make it work and has a purpose.

Dead Parrot · 05-27-2019, 08:13 AM

If you opt to remove that, you will need to make sure your gas tank(s) get venting. Simply plugging the line to the tank will most likely create fuel flow problems. Plus plan on getting used to a gas smell as instead of being captured by the canister, the vent fumes will simply smell as they are released.

This thread has the no canister system: http://67-72chevytrucks.com/vboard/s...d.php?t=786794

100%Chevy · 05-27-2019, 09:10 AM

Quote:

Originally Posted by TKCR

No, a lot of people take them out anyways. Cleans up the engine room. Odd place for it though. It usually mounted low, in the front of the engine room.

That's where they are mounted on 6 cylinder trucks.Mine's in the same place.
mike.

**WorkinLonghorn** · 05-27-2019, 10:04 AM

Good luck trying to register your truck in San Francisco with smog devices removed.

Just hook it up with good vacuum lines.

*gmachinz* · 05-28-2019, 11:18 AM

Fuel vapor is a great “additive” to the combustion process-anything to enrich the flammability rate of your mixture is a good thing-the more complete the burn, the more (to a point) you can extend the lean limits to pick up slightly more fuel economy.

demian5 · 05-28-2019, 04:34 PM

Quote:

Originally Posted by WorkinLonghorn

Good luck trying to register your truck in San Francisco with smog devices removed.

Just hook it up with good vacuum lines.

x2. You must be new to CA.

Make sure you hook it up to the right port on the carb...

Greasey Harley · 05-30-2019, 02:15 AM

That is the best evap canister you could have.
Easiest one to hook up, and no extra crap.
Run the fuel tank vent(s) to one side, plug the other side into the big port on the front of your carb and VIOLA! No more stinky gas fumes.
Good stuff.
I would move it to the core support just in front of the steering box.

Funstuie · 05-30-2019, 02:34 AM

Quote:

Originally Posted by WorkinLonghorn

Good luck trying to register your truck in San Francisco with smog devices removed.

Just hook it up with good vacuum lines.

This truck was smoged and registered in this condition. I haven’t removed anything it’s still in the engine bay just not connected to anything.

It won’t require a new smog till 2020. Maybe the law will be updated to exempt later 70’s vehicles (one can hope).

I can’t find where on the carb it should be connected though.

Greasey Harley · 05-30-2019, 08:11 PM

Quote:

Originally Posted by Funstuie

...

I can’t find where on the carb it should be connected though.

How 'bout a photograph of that-there carburetor?

Funstuie · 05-30-2019, 08:50 PM

Quote:

Originally Posted by Greasey Harley

How 'bout a photograph of that-there carburetor?

Like this

Funstuie · 05-30-2019, 08:51 PM

Stupid photos won’t rotate

Greasey Harley · 05-30-2019, 10:30 PM

I would plug it in to that open port on the drivers side front, down by the idle screw.
I think that is a vent. (Somebody please correct me if I'm wrong)
Either way, It should live happily there.

Funstuie · 05-30-2019, 10:39 PM

Quote:

Originally Posted by Greasey Harley

I would plug it in to that open port on the drivers side front, down by the idle screw.
I think that is a vent. (Somebody please correct me if I'm wrong)
Either way, It should live happily there.

This one?

Greasey Harley · 05-30-2019, 10:51 PM

just to the left of that circle

Funstuie · 05-30-2019, 10:54 PM

Quote:

Originally Posted by Greasey Harley

just to the left of that circle

Perfect. I see it now. Thanks.

Greasey Harley · 05-30-2019, 10:55 PM

Happy to help

05-26-2019, 09:14 PM	#1
Funstuie Registered User Join Date: Apr 2018 Location: San Francisco, California Posts: 52	Another “what is this” post from me Hey all Quick one. Doing some upgrades and clean up on the 76 c19 today I discovered that this canister is not connected to anything. The hose gonna to the engine is just hanging there not connected and the hose going down is split open next to the radiator. So with no fear of looking stupid my question is, what is it? Thanks Attached Images

05-26-2019, 09:19 PM	#2
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,933	Re: Another “what is this” post from me fuel vapor canister - part of emissions system.

05-27-2019, 12:23 AM	#5
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,052	Re: Another “what is this” post from me Those are used to make fuel vapor get sucked into the engine and burned. The system uses a nonvented gas cap so one way or another, the tank is being vented if the system isn't working. It's pretty simple to make it work and has a purpose.

05-27-2019, 08:13 AM	#6
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,472	Re: Another “what is this” post from me If you opt to remove that, you will need to make sure your gas tank(s) get venting. Simply plugging the line to the tank will most likely create fuel flow problems. Plus plan on getting used to a gas smell as instead of being captured by the canister, the vent fumes will simply smell as they are released. This thread has the no canister system: http://67-72chevytrucks.com/vboard/s...d.php?t=786794

05-27-2019, 10:04 AM	#8
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,855	Re: Another “what is this” post from me Good luck trying to register your truck in San Francisco with smog devices removed. Just hook it up with good vacuum lines. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

05-28-2019, 11:18 AM	#9
gmachinz Account Suspended Join Date: Jun 2011 Location: Des Moines, IA. Posts: 4,143	Re: Another “what is this” post from me Fuel vapor is a great “additive” to the combustion process-anything to enrich the flammability rate of your mixture is a good thing-the more complete the burn, the more (to a point) you can extend the lean limits to pick up slightly more fuel economy.

05-30-2019, 02:15 AM	#11
Greasey Harley Registered User Join Date: May 2013 Location: Post Falls, ID Posts: 884	Re: Another “what is this” post from me That is the best evap canister you could have. Easiest one to hook up, and no extra crap. Run the fuel tank vent(s) to one side, plug the other side into the big port on the front of your carb and VIOLA! No more stinky gas fumes. Good stuff. I would move it to the core support just in front of the steering box. Last edited by Greasey Harley; 05-30-2019 at 02:22 AM.

05-30-2019, 08:51 PM	#15
Funstuie Registered User Join Date: Apr 2018 Location: San Francisco, California Posts: 52	Re: Another “what is this” post from me Stupid photos won’t rotate

05-30-2019, 10:30 PM	#16
Greasey Harley Registered User Join Date: May 2013 Location: Post Falls, ID Posts: 884	Re: Another “what is this” post from me I would plug it in to that open port on the drivers side front, down by the idle screw. I think that is a vent. (Somebody please correct me if I'm wrong) Either way, It should live happily there.

05-30-2019, 10:51 PM	#18
Greasey Harley Registered User Join Date: May 2013 Location: Post Falls, ID Posts: 884	Re: Another “what is this” post from me just to the left of that circle

05-30-2019, 10:55 PM	#20
Greasey Harley Registered User Join Date: May 2013 Location: Post Falls, ID Posts: 884	Re: Another “what is this” post from me Happy to help



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