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by Rex_tulips - 30/07/25 07:59 PM
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Forums34
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Aug 24th, 2023
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There are no members with birthdays on this day. |
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Joined: Mar 2017
Posts: 2,222 Likes: 20
Talk Morgan Expert
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Talk Morgan Expert
Joined: Mar 2017
Posts: 2,222 Likes: 20 |
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 This shouldn’t do this, I’ve had the same problems, it split my fuel tank in the end. Luckily my car was still under warranty, and the tank was replaced, the car also had to go back to the factory in the end to have the breathing issues fixed.
Craig Jezz
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Joined: Mar 2017
Posts: 2,222 Likes: 20
Talk Morgan Expert
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Talk Morgan Expert
Joined: Mar 2017
Posts: 2,222 Likes: 20 |
Craig Jezz
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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 |
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? Modern cars do vent the tanks but they go through an activated charcoal filter first. There should be no negative or positive pressure in the tank at any time.
Bob
2009 Black Roadster
1999 4/4 2 litre Zetec
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Joined: Dec 2017
Posts: 2,041 Likes: 71
Talk Morgan Expert
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Talk Morgan Expert
Joined: Dec 2017
Posts: 2,041 Likes: 71 |
Craig,
Did you find out what the cause was for the vacuum when the factory sorted it?
Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
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Joined: Mar 2009
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Talk Morgan Addict
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Talk Morgan Addict
Joined: Mar 2009
Posts: 3,666 Likes: 43 |
To test whether air is rushing in or out of the tank fix a rubber glove over the filler before releasing the cap.
Nick
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Joined: Mar 2017
Posts: 2,222 Likes: 20
Talk Morgan Expert
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Talk Morgan Expert
Joined: Mar 2017
Posts: 2,222 Likes: 20 |
Mine wasn't a simple fix. There's lots going on with the modern Morgan fuel tanks, with roll over valves, charcoal canisters, computers that tell the valves when to purge the canister of vapour etc etc. Not like the older cars with self vented fuel filler caps. The first thing to check (IMO) is the roll over valve (No 18 in the image) but this isn't easy to access on Sports with no spare wheel. 
Last edited by Craig Jezz; 22/03/19 03:38 PM.
Craig Jezz
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Joined: Nov 2015
Posts: 7,910 Likes: 242
Just barreling along Talk Morgan Guru
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Just barreling along Talk Morgan Guru
Joined: Nov 2015
Posts: 7,910 Likes: 242 |
My previous S1 Roadster definitely had negative pressure in the tank, if you fuelled up soon after stopping in a PFS, however never had any fuel related issues in 10 yrs, but back then tanks were steel
Jon M
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Joined: May 2014
Posts: 5,110 Likes: 56
Black Rat Charter Member
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Black Rat Charter Member
Joined: May 2014
Posts: 5,110 Likes: 56 |
I don't get any neg or pos pressure in my tank but after filling up fuel fumes until the tank goes down to about half full, any ideas?
Keith
2013 narrow bodied + 4 Ruby.
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Joined: Aug 2011
Posts: 7,553 Likes: 88
Talk Morgan Guru
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Talk Morgan Guru
Joined: Aug 2011
Posts: 7,553 Likes: 88 |
I don't get any neg or pos pressure in my tank but after filling up fuel fumes until the tank goes down to about half full, any ideas? Keith The first thing I would check is the rubber fuel filler hose and venting pipe. Remove the spare wheel and have a look. They tend to age harden.
Bud
4/4 "Stanley"
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Joined: May 2014
Posts: 5,110 Likes: 56
Black Rat Charter Member
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Black Rat Charter Member
Joined: May 2014
Posts: 5,110 Likes: 56 |
I don't get any neg or pos pressure in my tank but after filling up fuel fumes until the tank goes down to about half full, any ideas? Keith The first thing I would check is the rubber fuel filler hose and venting pipe. Remove the spare wheel and have a look. They tend to age harden. Simon have checked the connections are tight now considering changing them all.
Keith
2013 narrow bodied + 4 Ruby.
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