| Fuel Vapor seperator repair [message #310982] |
Sun, 27 November 2016 11:02  |
Atom Ant
Messages: 170
Registered: October 2016
Location: Austin, TX
Karma: 0
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Hey all-
No suprise, the PO bypassed the fuel vapor seperator. I removed it and can see why it was by passed. The bottom plate is totally bowed out.
After cleaning it up, and de funking the passages, I need to re attach the bottom plate.
I found Ken H's tutorial on the photo site, but was curious how the JB weld held up? Any thing you'd do different? I was going to use plastic epoxy, but it's sensitive to some types of plastic.
1976 Palm Beach
Austin, TX
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| Re: [GMCnet] Fuel Vapor seperator repair [message #310995 is a reply to message #310982] |
Sun, 27 November 2016 13:44  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Adam,
I'd forgotten about that album. And was surprised when I saw the Jan 09
posting date. I guess 7-1/2 years isn't too bad for such a simple repair
-- it's still not leaking. Kudos to JBWeld!
Ken H.
On Sun, Nov 27, 2016 at 12:02 PM, Adam Metzger
wrote:
> Hey all-
>
> No suprise, the PO bypassed the fuel vapor seperator. I removed it and
> can see why it was by passed. The bottom plate is totally bowed out.
>
> After cleaning it up, and de funking the passages, I need to re attach the
> bottom plate.
>
> I found Ken H's tutorial on the photo site, but was curious how the JB
> weld held up? Any thing you'd do different? I was going to use plastic
> epoxy,
> but it's sensitive to some types of plastic.
> --
>
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Ken Henderson
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www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Fuel Vapor seperator repair [message #311030 is a reply to message #311029] |
Mon, 28 November 2016 16:14 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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I tried fixing mine a couple of times but it still pukes all over when I fill up.
I'm just going to buy one from Jim as expensive as it is
________________________________
From: Gmclist on behalf of David Horowitz
Sent: Monday, November 28, 2016 3:47:13 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Fuel Vapor seperator repair
Would you kindly post a link to the photo page showing the referenced presentation?
Please and thank you!
Dave
--
David del Rio - 75 Avion - Raymond, CA
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Fuel Vapor seperator repair [message #311037 is a reply to message #311030] |
Mon, 28 November 2016 18:29 |
David del Rio
Messages: 49
Registered: April 2016
Location: Raymond CA
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keith (and All),
being the neub that i am, i do not understand what role the Vapor Separator plays in fuel burping back when filling up.
please help me to understand the issue... as i thought it was just 'the nature of the beast' that the 70's era filler was prone to spitting up once you trick the pump handle with a piece of swimming pool noodle. that being a result of pressurization of the fuel system in the coach caused by the tight seal between the nozzle and filler neck.
the more detail you can provide... the better, as i'm new to this. thanks for your time!
best,
dave
David del Rio - 75 Avion - Raymond, CA
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| Re: Fuel Vapor seperator repair [message #311059 is a reply to message #310982] |
Tue, 29 November 2016 10:06 |
Atom Ant
Messages: 170
Registered: October 2016
Location: Austin, TX
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As I understand it, the fuel vapor seperator keeps liquid fuel from making it up front to the vapor canister, but allowing fuel vapor into the canister in the front passenger wheel well.if liquid fuel makes it into the seperator, the ball floats and closed the needle valve. This is part of the early stages of emission controls in the 70s, but can apparently cause venting issues if blocked or bypassed.
1976 Palm Beach
Austin, TX
[Updated on: Tue, 29 November 2016 10:07] Report message to a moderator |
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| Re: [GMCnet] Fuel Vapor seperator repair [message #311089 is a reply to message #311037] |
Tue, 29 November 2016 16:10 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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David del Rio wrote on Mon, 28 November 2016 19:29keith (and All),
being the neub that i am, i do not understand what role the Vapor Separator plays in fuel burping back when filling up.
please help me to understand the issue... as i thought it was just 'the nature of the beast' that the 70's era filler was prone to spitting up once you trick the pump handle with a piece of swimming pool noodle. that being a result of pressurization of the fuel system in the coach caused by the tight seal between the nozzle and filler neck.
the more detail you can provide... the better, as i'm new to this. thanks for your time!
best,
dave
Dave,
The vapor separator or vapor valve has nothing to do with the coach puking fuel during fueling. As stated down the thread, it sole purpose is to keep liquid fuel from getting to the carbon canister.
If you want to stop the puking fuel, you probably want to separate the fill vent lines. I was having a bad time fueling at all (45mins) but I finally figured it out and wrote about it in a message called "Recommending High T". If you go to the top right of the forum page and put that in the search box, you will get a bunch of stuff. Now go left and click "subject only". You will have the thread in archeological order (Older is lower) and the first post is what you want. You should take the time to read the whole thread.
Matt
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] Fuel Vapor seperator repair [message #311120 is a reply to message #311108] |
Wed, 30 November 2016 14:37 |
David del Rio
Messages: 49
Registered: April 2016
Location: Raymond CA
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I get your drift Matt.
At this point my coach is spending more time on a lift than on the highway, but I do see some light at the end of the ramps I built. It's not just the coach, I've got my own issues keeping me off the road as well. I'm fortunate to have some folks who are directly helping me get things straightened out but I come to this forum so as to not lean on them all the time... and also to get to know the community better.
I continue to poke into the dark corners of the GMCforum reading old threads to learn about the issues and ideas of others. Often I am in awe at the technical level of expertise and creativeness found here, to say nothing of the automotive and RV systems experience of the community members. No doubt my TZE would be sitting in the weeds if not for this forum.
Adam and all... I did not mean to hijack this thread!
Have a great day all.
Dave
David del Rio - 75 Avion - Raymond, CA
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| Re: Fuel Vapor seperator repair [message #311161 is a reply to message #311121] |
Thu, 01 December 2016 14:54 |
David del Rio
Messages: 49
Registered: April 2016
Location: Raymond CA
Karma: 0
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Atom Ant wrote on Wed, 30 November 2016 13:21
Then I thought about some of these guys that have been doing this for years and needs to remind myself this is a long game.
Thanks for the reminder, well said! Sorry to hear about your front end issues. Fortunately changing the shocks is not a terrible job. Good luck.
Best,
Dave
David del Rio - 75 Avion - Raymond, CA
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