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Another fuel question [message #289227]

Fri, 23 October 2015 09:53

78403

Messages: 21
Registered: October 2015
Location: Kingman AZ

Karma: 0

Junior Member

I have heard of some couch owners getting rid of the canister and just running a vent line down from the fuel separator. Can this be done or can the canister lines on the tanks be capped and just use a vented fuel cap? I don't have emission testing here and will never live where I need to. I would love to get rid of the canister and the line that runs all the way up there. Maybe there is another way of doing this?

Marvin Briggs 1978 23'birch redone interior modernized. Mostly stock olds 403 original 80,000 miles Kingman AZ

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Re: Another fuel question [message #289232 is a reply to message #289227]

Fri, 23 October 2015 10:37

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Marvin,

There is an easily missed issue here. That canister has two functions. One is to trap fuel vapors and the other is to filter the air going back into the tank to replace fuel as it is used. If your vent valve is good, you could disconnect the canister (just leave it there in case some FO wants it), cap the port on the carburetor and put a little cheap fuel filter on the line out of the vent valve to keep bugs and dirt out. If you take out the vent valve, you have to change to a vented fuel cap.

Matt

78403 wrote on Fri, 23 October 2015 10:53

I have heard of some couch owners getting rid of the canister and just running a vent line down from the fuel separator. Can this be done or can the canister lines on the tanks be capped and just use a vented fuel cap? I don't have emission testing here and will never live where I need to. I would love to get rid of the canister and the line that runs all the way up there. Maybe there is another way of doing this?

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: [GMCnet] Another fuel question [message #289233 is a reply to message #289227]

Fri, 23 October 2015 10:38

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

Marvin, please give removal some careful consideration. The big reason NOT
TO REMOVE it is today's gasoline. It is much more volatile than fuel
without alcohol, and, it expands greatly when warmed. It severely taxes a
properly functioning cannister system to keep the expansion in check. Do
you really want to pay hard earned money for gasoline only to have it
evaporate into the air where you will receive no benefit from the
purchase? The canister absorbs those aromatic hydrocarbons that you paid
for and routes them into the engine, where they add to your fuel miles per
gallon. Your choice. Pay yourself or pay Standard Oil company some more
money for evaporated fuel.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Oct 23, 2015 7:54 AM, "marvin" wrote:

> I have heard of some couch owners getting rid of the canister and just
> running a vent line down from the fuel separator. Can this be done or can
> the
> canister lines on the tanks be capped and just use a vented fuel cap? I
> don't have emission testing here and will never live where I need to. I
> would
> love to get rid of the canister and the line that runs all the way up
> there. Maybe there is another way of doing this?
> --
> Marvin Briggs
> 1978 23' Transmode redone interior modernized.
> Mostly stock
> olds 403 original 80,000 miles
> Kingman AZ
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Re: Another fuel question [message #289234 is a reply to message #289232]

Fri, 23 October 2015 10:40

appie

Messages: 902
Registered: April 2013
Location: denmark

Karma: 2

Senior Member

And, ofcourse, then the tanks vent just outside of your sidewindow!

Appie eleganza 76 "Olga" now sadly sold 6 wheel discbrake Quadrabags Springfield stage 2 462 olds Manny tranny ( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html Fulltiming in Europe july 2014 til july 2016 Denmark

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Re: Another fuel question [message #289243 is a reply to message #289227]

Fri, 23 October 2015 11:51

roy1

Messages: 2126
Registered: July 2004
Location: Minden nevada

Karma: 6

Senior Member

Before you go to a vented cap loosen the cap for a time in warm weather. You will hate the stink of raw gas coming in the toll window as you go down the road

Roy Keen Minden,NV 76 X Glenbrook

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Re: Another fuel question [message #289244 is a reply to message #289227]

Fri, 23 October 2015 12:43

78403

Messages: 21
Registered: October 2015
Location: Kingman AZ

Karma: 0

Junior Member

Ok good answers. Where does the canister vacuum connection go? Straight to manifold vacuum or ported?

Marvin Briggs 1978 23'birch redone interior modernized. Mostly stock olds 403 original 80,000 miles Kingman AZ

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Re: [GMCnet] Another fuel question [message #289252 is a reply to message #289244]

Fri, 23 October 2015 18:54

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

For people thinking of way to get more power by bypassing emission system,
I can tell you of one thing that will give you more power.
Cap off the PVC connection to the carburetor. Lot of hot air from the
crankcase will be kept from entering the intake and thus it will run better
as cool air gives you more power.
NOW the fumes from the crankcase will somehow enter the passenger
compartment and fumigate you .
So what you gain is not always that great.
I have helped numerous GMC owners pass he CARB (California Air Resource
Board)
Emmision test.
I say; if your system is running half way dissent, you never need to worry
passing a test here.

On Fri, Oct 23, 2015 at 10:43 AM, marvin wrote:

> Ok good answers. Where does the canister vacuum connection go? Straight to
> manifold vacuum or ported?
> --
> Marvin Briggs
> 1978 23' Transmode redone interior modernized.
> Mostly stock
> olds 403 original 80,000 miles
> Kingman AZ
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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