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Excessive fuel tank pressure
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poly
Posted 2016-12-16 5:34 AM (#528851)
Subject: Excessive fuel tank pressure



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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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Viper Guy
Posted 2016-12-16 11:08 AM (#528879 - in reply to #528851)
Subject: RE: Excessive fuel tank pressure



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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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Powerflite
Posted 2016-12-16 5:46 PM (#528906 - in reply to #528879)
Subject: RE: Excessive fuel tank pressure



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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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poly
Posted 2016-12-18 3:12 AM (#529018 - in reply to #528906)
Subject: RE: Excessive fuel tank pressure



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Posts: 161
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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.
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57plybel
Posted 2016-12-18 8:12 PM (#529089 - in reply to #528851)
Subject: RE: Excessive fuel tank pressure



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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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