Member Since: 29 Nov 2005
Location: Hampshire
Posts: 255
Fuel filler cap- possible issue?
With my brand new Landmark I have become aware on every release of the fuel filler an evident “glug-glug” sound of relocating fuel; though no discernible in rushing of air.
After over ten years with Disco3s this has never been evident, but now every time I stop for long enough to do so I go release the fuel cap just in case I am in danger of vacuum reshaping the fuel tank, or sucking back the fuel delivery lines dry overnight.
Just twenty miles of towing [about a gallon] down autoroutes in France was plenty to induce every time this effect. So I was stopping at each Aire, very tedious.
Now is this a standard feature due to some redesign of the fuel return system or a change in the pressure regulation of the tank, or is it a fault on this particular vehicle?
19th Jul 2016 7:57 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Sounds normal to me.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025
also to me plus a "pffff" for a small tank overpressureDiscovery 5 tdv6 HSE Corris Gray Outback Engineering Limited Edition IID Pro MV License
19th Jul 2016 1:26 pm
EMcC
Member Since: 10 Jul 2015
Location: Wiltshire
Posts: 536
When I open my fuel cap it also makes a 'Glug Glug' sound.
I always thought it was the tanks way of saying 'Yippee, drinky time'
19th Jul 2016 10:55 pm
Ocsid
Member Since: 29 Nov 2005
Location: Hampshire
Posts: 255
Thank you all; so this new to me glug-glugging is par for the course and not something of concern. Thanks.
20th Jul 2016 9:42 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
As you have found the tank is not vented direct to atmosphere (to reduce vapour loss) and the vast majority of fuel pumped away by the LP pump comes straight back to the tank, with only the fuel used by the engine reducing the volume and the overall pressure in the tank.
The amount of air noise heard on cap removal is dependent on fuel level and how much fuel has been used on the journey. As the LP fuel is on a circuit the drop in pressure does not strain the pumps. The tank does not collapse on a long journey due to the pressure relief valves allowing a controlled amount of air in and close to zero vapour out.
Land Rover - Turning Drivers into Mechanics Since 1948
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