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Aug 24th, 2023
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Joined: Dec 2018
Posts: 1,309 Likes: 5
Has a lot to Say!
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OP
Has a lot to Say!
Joined: Dec 2018
Posts: 1,309 Likes: 5 |
Quick Q folks
When I fill up and undo the fuel cap there is an almighty woosh of pertol infused gas rushing out to meet me. Is this normal ? shouldnt the tank be vented in some way. My other cars dont do this.
I presume its petrol evaporating in the tank?
Bonesie Current stead -'The Captain' Black +4 'Life is like a garden, dig it' *Joe Dirt 
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Joined: Jul 2007
Posts: 26,760 Likes: 424
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 26,760 Likes: 424 |
They do it from time to time. don't worry.
JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
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Joined: Apr 2017
Posts: 1,799 Likes: 3
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Apr 2017
Posts: 1,799 Likes: 3 |
Never had that on mine.
As you say, the tank is vented so why should there be a pressure build up?
Bob
2009 Black Roadster
1999 4/4 2 litre Zetec
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Joined: Dec 2009
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Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 35,790 Likes: 471 |
I've never experienced this on any of mine. Craig will be along soon he had a bit of a saga with his but I think it was a vacuum instead of it pressurising.
2009 4/4 Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev
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Joined: May 2011
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Has a lot to Say!
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Has a lot to Say!
Joined: May 2011
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I suspect that it may be air rushing into the tank rather than out of it. At the end of every run in the car, undo the filler cap and check whether the condition continues. If it does, there may be a blockage in part of the evaporative system and it should be investigated further. I have just experienced the same on another marque, other examples of which have suffered sufficient vacuum to implode the plastic fuel tank.
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Joined: Mar 2009
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Smile, it confuses them Member of the Inner Circle
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Smile, it confuses them Member of the Inner Circle
Joined: Mar 2009
Posts: 11,221 Likes: 159 |
I also had that on the Series 2. Breather was blocked.
Everyone loves a Morgan. Even me, unless it's broken again.
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Joined: Jan 2009
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Charter Member
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Charter Member
Joined: Jan 2009
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With modern cars, they arent allowed to vent fuel vapour into the air for enviromentalist reasons. Could just be a vacuum created as fuel is used up?
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Joined: May 2010
Posts: 9,285 Likes: 69
Needs to Get Out More!
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Needs to Get Out More!
Joined: May 2010
Posts: 9,285 Likes: 69 |
The vent should allow air in to prevent a vacuum effect AND seal off if the car overturns to prevent fuel leakage through it.
Your symptoms sound like a blockage or sticking of the vent valve.
Plus Four MY23 Furka Rouge
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Joined: Dec 2018
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OP
Has a lot to Say!
Joined: Dec 2018
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Cheers folks. I will do another couple of fill ups and see whats what. Im sure its venting out rather than in but will double check on next fill up.
Bones
Bonesie Current stead -'The Captain' Black +4 'Life is like a garden, dig it' *Joe Dirt
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Joined: Apr 2016
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miles of smiles Talk Morgan Expert
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miles of smiles Talk Morgan Expert
Joined: Apr 2016
Posts: 2,336 Likes: 150 |
My 4/4 has been doing that since new in 2016, once it breaks completely, I’ll maybe take a look at it  . In the meantime, I’ve not experienced any adverse effects like fuel starvation or petrol smells coming into the car, leave it the alone I’d say.
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