Home » Public Forums » GMCnet » [GMCnet] Liquid/Vapor Separator
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| Re: [GMCnet] Liquid/Vapor Separator [message #77948 is a reply to message #77943] |
Wed, 24 March 2010 23:53   |
bukzin
Messages: 840
Registered: April 2004
Location: North California
Karma: 0
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Senior Member |
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[quote title=Ken Henderson wrote on Wed, 24 March 2010 20:56]During the discussions of the liquid/vapor separator, I forgot that I had
photos of my last repair. So here's what you were searching for, Paul:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Ken, Seems to me that when I first got my coach it leaked
if I tried to completely fill my fuel tank.
Would that make sense?
Would my 1977 California coach have this as part of
my emissions package?
Bukzin
1977 Palm Beach
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| Re: [GMCnet] Liquid/Vapor Separator [message #77966 is a reply to message #77948] |
Thu, 25 March 2010 06:20 |
GMCWiperMan
Messages: 1248
Registered: December 2007
Karma: 1
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Senior Member |
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I agree with Gene that the hoses on the top of the tank are a more likely
source of leaks. For fuel to be forced to the separator, it probably has to
be trapped in the hoses leading there and forced up by air forced from the
filling tank -- which would more likely escape through the filler neck or
its vent hose. Or, you'd have to fill the tanks until the level in the
filler neck was above the level of the separator (the reason a moved
separator should be located HIGH).
To answer your question about the Picasa photo: Yes, I used JB Weld for the
latest separator repair after Gorilla Glue failed.
I don't know much about the CA configuration but my understanding is that
the separator system is the same except for using two carbon cannisters.
Ken H.
On Thu, Mar 25, 2010 at 12:53 AM, Richard <bukzin@gmail.com> wrote:
>
>
> [quote title=Ken Henderson wrote on Wed, 24 March 2010 20:56]During the
> discussions of the liquid/vapor separator, I forgot that I had
> photos of my last repair. So here's what you were searching for, Paul:
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
> Ken, Seems to me that when I first got my coach it leaked
> if I tried to completely fill my fuel tank.
>
> Would that make sense?
>
>
>
> Would my 1977 California coach have this as part of
> my emissions package?
> --
>
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| Re: [GMCnet] Liquid/Vapor Separator [message #77971 is a reply to message #77966] |
Thu, 25 March 2010 06:38 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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The vapor seperator unit is actually a very important part of the fuel delivery system. If the unit fails open, fuel will reach the canister and you have a strong chance that fuel will be sucked up into the carb flooding it. If it fails closed you will not be properly venting the tanks and a suction in the tanks may cause the pump to not be able to suck fuel to the carb-- also it might be really hard and slow filling the tanks. If the unit cracks or the bottom falls off you will blow out fuel when you fill the tanks. We have an aftermarket unit available for I thing $90. It is a silly part, one most do not think about but one that will really mess with you. It's not a rocket science part but it is no longer available so it's one we really need to watch.
Jim Bounds
----------------------
----- Original Message ----
From: Ken Henderson <ken0henderson@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Thu, March 25, 2010 7:20:08 AM
Subject: Re: [GMCnet] Liquid/Vapor Separator
I agree with Gene that the hoses on the top of the tank are a more likely
source of leaks. For fuel to be forced to the separator, it probably has to
be trapped in the hoses leading there and forced up by air forced from the
filling tank -- which would more likely escape through the filler neck or
its vent hose. Or, you'd have to fill the tanks until the level in the
filler neck was above the level of the separator (the reason a moved
separator should be located HIGH).
To answer your question about the Picasa photo: Yes, I used JB Weld for the
latest separator repair after Gorilla Glue failed.
I don't know much about the CA configuration but my understanding is that
the separator system is the same except for using two carbon cannisters.
Ken H.
On Thu, Mar 25, 2010 at 12:53 AM, Richard <bukzin@gmail.com> wrote:
>
>
> [quote title=Ken Henderson wrote on Wed, 24 March 2010 20:56]During the
> discussions of the liquid/vapor separator, I forgot that I had
> photos of my last repair. So here's what you were searching for, Paul:
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
> Ken, Seems to me that when I first got my coach it leaked
> if I tried to completely fill my fuel tank.
>
> Would that make sense?
>
>
>
> Would my 1977 California coach have this as part of
> my emissions package?
> --
>
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Liquid/Vapor Separator [message #78065 is a reply to message #77971] |
Fri, 26 March 2010 01:04 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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| Jim Bounds wrote on Thu, 25 March 2010 04:38 |
If it fails closed you will not be properly venting the tanks and a suction in the tanks may cause the pump to not be able to suck fuel to the carb-- also it might be really hard and slow filling the tanks.
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Listen to Jim. This is the good part. Vapor is trapped in the canister. Without the system, it would be lost in the air. The good part is, while driving, the vapor is sucked into the engine and we get to use it.
In addition to what Jim said, if the separator sticks shut, pressure can build in the tanks. This will happen quicker if you have fuel injection, as gas goes up to the top of the engine and what is not use goes back to the fill tank. Our '78 had problems venting for a while. Opening the gas cap too quickly could get you the bath Jim talks about.
When we filled, the gas gauge would go to almost 3/4 in the first 1/2 hour of driving on a warm day. This is because it takes almost no pressure to bow out the tanks, both bottom and top. (You can do it easily with your lung pressure when the tanks are out and sealed.)
WHen the gauge would start dropping fast, I would pull over and tap on the separator. It would begin pulsing... burping vapor if you will. This was probably vapor moving so fast the it was blowing the ball up to the top... stopping the vapor movement and then letting the ball drop. The pulsing was probably two pulses per second.
If you are too full, gas in the separator shuts it off. It would seem that this condition would not resolve itself, but it does. It is my theory that at that point pressure builds in the tanks, bowing out the top and bottom. Eventually, this lowers the liquid level in relation to the top of the tank, gas can drain down the hoses, the ball is released and vapor escapes.
If there was too much pressure, the ball would be held up by pressure. Tapping on it would start it venting again. If tapping didn't help, I had to release... very slowly... the pressure at the gas cap. I never had to stop more than once.
Once the pressure was released, the gauge would read full again. I have heard empty tanks rumble a bit when the cap was released suddenly.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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