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![](/forums/profile/get-photo.asp?memberid=3393&type=profile&rnd=447) Veteran
Posts: 161
![100](http://www.forwardlook.net/forums/images/decorations/multiple/100.gif) ![25](http://www.forwardlook.net/forums/images/decorations/multiple/25.gif) ![25](http://www.forwardlook.net/forums/images/decorations/multiple/25.gif) Location: Melbourne, Australia | I've always had an issue with a build up of pressure in the tank on my 57 Plymouth so finally got around to replacing the cap with a vented unit. Went to check it the next day and the tank had filled up with vapour yet again, enough pressure to slightly expand the tank itself ! Should I just drill a hole in the cap and leave it at that ? |
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![](/forums/profile/get-photo.asp?memberid=6620&type=profile&rnd=248) Expert
Posts: 2004
![2000](http://www.forwardlook.net/forums/images/decorations/multiple/2000.gif) Location: Branson, MO | poly - 2016-12-16 4:34 AM
I've always had an issue with a build up of pressure in the tank on my 57 Plymouth so finally got around to replacing the cap with a vented unit. Went to check it the next day and the tank had filled up with vapor yet again, enough pressure to slightly expand the tank itself ! Should I just drill a hole in the cap and leave it at that ?
I've seen this done before although I didn't do it myself. Seemed to work OK from what I recall and no one got "blown up". So in my opinion, a vent is a vent. |
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![](/forums/profile/get-photo.asp?memberid=140&type=profile&rnd=753) Expert 5K+
Posts: 9743
![5000](http://www.forwardlook.net/forums/images/decorations/multiple/5000.gif) ![2000](http://www.forwardlook.net/forums/images/decorations/multiple/2000.gif) ![2000](http://www.forwardlook.net/forums/images/decorations/multiple/2000.gif) ![500](http://www.forwardlook.net/forums/images/decorations/multiple/500.gif) ![100](http://www.forwardlook.net/forums/images/decorations/multiple/100.gif) ![100](http://www.forwardlook.net/forums/images/decorations/multiple/100.gif) ![25](http://www.forwardlook.net/forums/images/decorations/multiple/25.gif) Location: So. Cal | I have the same problem. Did the definition of "vented" change over time? My cap doesn't seem to vent much, if at all. |
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![](/forums/profile/get-photo.asp?memberid=3393&type=profile&rnd=447) Veteran
Posts: 161
![100](http://www.forwardlook.net/forums/images/decorations/multiple/100.gif) ![25](http://www.forwardlook.net/forums/images/decorations/multiple/25.gif) ![25](http://www.forwardlook.net/forums/images/decorations/multiple/25.gif) Location: Melbourne, Australia | Well I decided to just drill a hole and be done with it. There is no more pressure build up and only a very slight smell of petrol around the cap so I think that it's problem solved. ![](http://www.forwardlook.net/forums/images/emoticons/wink.gif) |
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![](/forums/profile/get-photo.asp?memberid=1631&type=profile&rnd=69) Extreme Veteran
Posts: 594
![500](http://www.forwardlook.net/forums/images/decorations/multiple/500.gif) ![25](http://www.forwardlook.net/forums/images/decorations/multiple/25.gif) ![25](http://www.forwardlook.net/forums/images/decorations/multiple/25.gif) ![25](http://www.forwardlook.net/forums/images/decorations/multiple/25.gif) Location: Melbourne, Australia | I have that same issue; even with the cap OFF, I can hear the fuel climbing the filler pipe and dripping down the quarter panel... 57 Plymouth just like yours, Poly..... "only" happens in warm weather but a real hazard in a confined space or parked on a public street with smokers walking past.... Colin |
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