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Where is the fuel tank vent?
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chopcat
 


Member Since: 08 Apr 2013
Location: chopcat
Posts: 441

United Kingdom 2009 Discovery 4 3.0 TDV6 HSE Auto Baltic BlueDiscovery 4
Where is the fuel tank vent?

On a D4.

Clearly , having replaced it, the fuel tank doesnt vent through the cap so im assuming there is one somewhere else.

Anyone know where?
 may the odds be ever in your favor  
Post #204023025th Mar 2019 10:12 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Kerry
Posts: 1128

Ireland 

Its not on the tank! Its on the filler neck Thumbs Up
(Edit) There's one in the cap too!
 Better to be looking at it, than looking for it!

08 D3 TDV6 Comm 
 
Post #204029426th Mar 2019 12:15 am
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chopcat
 


Member Since: 08 Apr 2013
Location: chopcat
Posts: 441

United Kingdom 2009 Discovery 4 3.0 TDV6 HSE Auto Baltic BlueDiscovery 4

Thanks

Its really odd. I have replaced the cap but a still getting vacum in the tank which leads to fuel starvation . At least thats my diagnosis.
After 100 miles at motorway speeds i get fluctuating speed or hesitancy (difficult to describe) . Then stop open fuel cap, guegle gurgle, and then we are off ok again.

Its in for a service soon so will see what james french have to say on the matter.

Tc
 may the odds be ever in your favor  
Post #204065227th Mar 2019 8:24 am
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Kerry
Posts: 1128

Ireland 

Can you actually hear escaping vacuum when you open the cap after a drive?
If so then clearly the cap is not doing its job. Gurgling noises might not necessarily be the same issue!
 Better to be looking at it, than looking for it!

08 D3 TDV6 Comm 
 
Post #204078127th Mar 2019 4:04 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 5786

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

Whenever I take the fuel cap off I can hear pressure coming out of the tank, not going in, I didn’t hear it on the D3.
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #204084427th Mar 2019 6:31 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Kerry
Posts: 1128

Ireland 

Pressure build up? that sounds a bit odd Confused I'm sure you already know as the level in the tank is run down, the displaced fuel is replaced with an equal amount of air drawn in through the cap vent. I would have thought if there was for some reason a pressure build up, it would be depleted in the same way as a vacuum build up. (ie the vent) If you're sure there is pressure present rather than a vacuum, is it enough to pop the cap off when released? Just curious.
 Better to be looking at it, than looking for it!

08 D3 TDV6 Comm 
 
Post #204086527th Mar 2019 7:06 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 5786

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

No, but there is a positive hiss and that can be in the morning before the engine has started so it can’t be caused by heat, no other indiscretions or problems, it does it whenever I put fuel in, just like opening a can of coke.
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #204089527th Mar 2019 8:09 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Kerry
Posts: 1128

Ireland 

Ah that'l be carbonated diesel then Laughing
 Better to be looking at it, than looking for it!

08 D3 TDV6 Comm 
 
Post #204090327th Mar 2019 8:36 pm
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denny crane
 


Member Since: 29 Mar 2008
Location: Warwickshire
Posts: 141

England 2010 Discovery 4 3.0 TDV6 XS Auto Stornoway GreyDiscovery 4

As I recall, the vent pipe runs up the side of the fuel filler pipe.

See if it’s been pinched (as in compressed, not stolen lol)
 Owner of a 2010 Discovery 4 XS.
Plus a Mitsubishi Outlander (don’t ask...) 
 
Post #205389217th May 2019 3:52 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 5786

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

chopcat wrote:
Thanks

Its really odd. I have replaced the cap but a still getting vacum in the tank which leads to fuel starvation . At least thats my diagnosis.
After 100 miles at motorway speeds i get fluctuating speed or hesitancy (difficult to describe) . Then stop open fuel cap, guegle gurgle, and then we are off ok again.

Its in for a service soon so will see what james french have to say on the matter.

Tc


Also a sign the fuel filter is partially blocked or non oem filter fitted. Thumbs Up
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #205502222nd May 2019 6:58 am
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