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chaosisme
Samba Member
Joined: August 29, 2005
Posts: 1256
Location: Orange County, Ca
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 Posted: Fri Nov 27, 2015 9:46 pm Post subject: Leaking gas out of cap? |
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I should probably start all my posts saying which if my cars Im talking about. In this case its the '68.
I recently replaced my crummy aftermarket Stant gas cap with an NOS original one. Ive noticed that whenever I go to fill up my tank, there is always some sticky gas residue on the bottom edge of the cap, like there is fuel leaking out of it. I wipe it off and every time I go to fill up, its there.
Any idea what is causing this?
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'65 1500 S [quareback]
'68 FI Sunroof Squareback
'70 Westy
OCT3 - Orange County Type 3's |
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KTPhil 
Samba Member
Joined: April 06, 2006
Posts: 34009
Location: Conejo Valley, CA
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| Posted: Fri Nov 27, 2015 11:14 pm Post subject: Re: Leaking gas out of cap? |
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| Faulty tank vent? |
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chaosisme
Samba Member
Joined: August 29, 2005
Posts: 1256
Location: Orange County, Ca
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| Posted: Fri Nov 27, 2015 11:24 pm Post subject: Re: Leaking gas out of cap? |
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| KTPhil wrote: |
| Faulty tank vent? |
What part do you think it might be exactly?
I've replaced the vent tube from the filler neck to the body. And Ive replaced the small vent hose that comes from the coupler. The only two other pieces I havent replaced are the big hoses coming from the tank to the coupler and from the coupler to the vent tube.
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'65 1500 S [quareback]
'68 FI Sunroof Squareback
'70 Westy
OCT3 - Orange County Type 3's |
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Mike Fisher
Samba Member
Joined: January 30, 2006
Posts: 17970
Location: Eugene, OR
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| Posted: Fri Nov 27, 2015 11:38 pm Post subject: Re: Leaking gas out of cap? |
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Always trying to fill it to the tiptop, which is discouraged/illegal now I believe. I stop the first time the nozzle clicks off as the EPA recommends! 
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69 FI/AT square Daily Driver
66 sunroof,67,70,71,71,71AT,72,72AT,73 Parts
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'68 Karmann Ghia sold
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chaosisme
Samba Member
Joined: August 29, 2005
Posts: 1256
Location: Orange County, Ca
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| Posted: Fri Nov 27, 2015 11:40 pm Post subject: Re: Leaking gas out of cap? |
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| Mike Fisher wrote: |
| Always trying to fill it to the tiptop, which is discouraged/illegal now I believe. I stop the first time the nozzle clicks off as the EPA recommends! |
I dont fill it to the tip top. I stop when the pump stops the first time. I dont want gas sitting in the rubber filler hose.
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'65 1500 S [quareback]
'68 FI Sunroof Squareback
'70 Westy
OCT3 - Orange County Type 3's |
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Bobnotch
Samba Member
Joined: July 06, 2003
Posts: 22422
Location: Kimball, Mi
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| Posted: Sat Nov 28, 2015 9:42 am Post subject: Re: Leaking gas out of cap? |
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| chaosisme wrote: |
I should probably start all my posts saying which if my cars Im talking about. In this case its the '68.
I recently replaced my crummy aftermarket Stant gas cap with an NOS original one. Ive noticed that whenever I go to fill up my tank, there is always some sticky gas residue on the bottom edge of the cap, like there is fuel leaking out of it. I wipe it off and every time I go to fill up, its there.
Any idea what is causing this? |
Dried out cork gasket?
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Bob 65 Notch S with Sunroof
71 Notch ...aka Krunchy; build pics here;
http://www.thesamba.com/vw/forum/viewtopic.php?t=249390 -been busy working
64 T-34 Ghia...aka Wolfie, under construction... http://www.thesamba.com/vw/forum/viewtopic.php?t=412120
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Air-Cooled Head
Samba Member
Joined: October 15, 2002
Posts: 4070
Location: Chicago Suburbs
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| Posted: Mon Nov 30, 2015 3:56 pm Post subject: Re: Leaking gas out of cap? |
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| Bobnotch wrote: |
| chaosisme wrote: |
I should probably start all my posts saying which if my cars Im talking about. In this case its the '68.
I recently replaced my crummy aftermarket Stant gas cap with an NOS original one. Ive noticed that whenever I go to fill up my tank, there is always some sticky gas residue on the bottom edge of the cap, like there is fuel leaking out of it. I wipe it off and every time I go to fill up, its there.
Any idea what is causing this? |
Dried out cork gasket? |
My first thought too. Chaos, did you have this problem with the old cap?
I'd suspect the NOS cap had a new cork gasket glued in. Now fuel vapors are reacting with the glue.
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Karly
Samba Member
Joined: August 01, 2002
Posts: 641
Location: Australia
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| Posted: Mon Nov 30, 2015 6:01 pm Post subject: Re: Leaking gas out of cap? |
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I had the same issue on my bug, when I replaced my cap with a new one I put in a new rubber seal at the same time, but I was also constantly wiping it. I decided to trial a new cork seal and its actually much better.
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chaosisme
Samba Member
Joined: August 29, 2005
Posts: 1256
Location: Orange County, Ca
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| Posted: Mon Nov 30, 2015 8:52 pm Post subject: Re: Leaking gas out of cap? |
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| Air-Cooled Head wrote: |
| Bobnotch wrote: |
| chaosisme wrote: |
I should probably start all my posts saying which if my cars Im talking about. In this case its the '68.
I recently replaced my crummy aftermarket Stant gas cap with an NOS original one. Ive noticed that whenever I go to fill up my tank, there is always some sticky gas residue on the bottom edge of the cap, like there is fuel leaking out of it. I wipe it off and every time I go to fill up, its there.
Any idea what is causing this? |
Dried out cork gasket? |
My first thought too. Chaos, did you have this problem with the old cap?
I'd suspect the NOS cap had a new cork gasket glued in. Now fuel vapors are reacting with the glue. |
No, my old cap had a really bad rubber gasket that was split in multiple places.
Here is a picture of the culprit. I have no idea how to tell if the gasket is dried out. I can say that it isnt glued in though. It happens no matter which way I put it on, both side are actually sticky right now with old gas.
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'65 1500 S [quareback]
'68 FI Sunroof Squareback
'70 Westy
OCT3 - Orange County Type 3's |
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Air-Cooled Head
Samba Member
Joined: October 15, 2002
Posts: 4070
Location: Chicago Suburbs
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| Posted: Fri Dec 04, 2015 3:50 pm Post subject: Re: Leaking gas out of cap? |
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Any solution yet?
I think I'd try a new rubber ring (or 2) just to see if it changes anything.
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Bobnotch
Samba Member
Joined: July 06, 2003
Posts: 22422
Location: Kimball, Mi
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| Posted: Fri Dec 04, 2015 9:39 pm Post subject: Re: Leaking gas out of cap? |
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| Air-Cooled Head wrote: |
Any solution yet?
I think I'd try a new rubber ring (or 2) just to see if it changes anything. |
Or a different gas cap.
_________________
Bob 65 Notch S with Sunroof
71 Notch ...aka Krunchy; build pics here;
http://www.thesamba.com/vw/forum/viewtopic.php?t=249390 -been busy working
64 T-34 Ghia...aka Wolfie, under construction... http://www.thesamba.com/vw/forum/viewtopic.php?t=412120
| Tram wrote: |
| "Friends are God's way of apologizing for relatives." |
| Tram wrote: |
| People keep confusing "restored" and "restroyed". |
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chaosisme
Samba Member
Joined: August 29, 2005
Posts: 1256
Location: Orange County, Ca
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| Posted: Fri Dec 04, 2015 11:01 pm Post subject: Re: Leaking gas out of cap? |
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No solution yet. I'm going to try and swap caps with my brother and see what happens. I did check it again tonight and the entire cap gasket was wet with fuel. I'm wondering how fuel is getting up there so easily in the first place.
_________________
'65 1500 S [quareback]
'68 FI Sunroof Squareback
'70 Westy
OCT3 - Orange County Type 3's |
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Air-Cooled Head
Samba Member
Joined: October 15, 2002
Posts: 4070
Location: Chicago Suburbs
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| Posted: Mon Dec 07, 2015 3:46 pm Post subject: Re: Leaking gas out of cap? |
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| chaosisme wrote: |
| No solution yet. I'm going to try and swap caps with my brother and see what happens. I did check it again tonight and the entire cap gasket was wet with fuel. I'm wondering how fuel is getting up there so easily in the first place. |
That's why I'm thinking it's NOT fuel. You'd have to over-fill then do some "spirited" driving to slosh fuel up to the cap. 
I think I'd try thoroughly cleaning out the cap, removing any hint of old glue. Then making my own gasket (2 or 3 even) and not using any glue, just to see.
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