 | Home > Technical > Runs fine with full fuel tank |
 
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| Balvaig Member Since: 19 Feb 2016 Location: Fife Posts: 730   
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I would start with the easy checks first. Have you checked fuel tank breather pipe for blockage, or is there signs of a vacuum building up in the tank as you use fuel (hissing when you remove the fuel cap).
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22nd Dec 2018 2:21pm |
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| ericvv Member Since: 02 Jun 2011 Location: Near the Jet d'Eau Posts: 5816  
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When you take the fuel cap off after your fuel tank has been running from full down to say 80% or so, do you hear a hissing sound? If so, it could mean that your fuel cap breather valve is blocked, and a vacuum is developing in your fuel tank which makes it more difficult for the fuel pump to draw a fuel supply. Same symptoms as you describe happened to me years ago, and a new fuel cap with a proper working breather valve solved it all,
Eric You never actually own a Defender. You merely look after it for the next generation. http://youtu.be/yVRlSsJwD0o https://youtu.be/vmPr3oTHndg https://www.youtube.com/watch?v=_GtzTT9Pdl0 https://www.youtube.com/watch?v=ABqKPz28e6A https://www.youtube.com/watch?v=rLZ49Jce_n0 https://www.youtube.com/watch?v=XvAsz_ilQYU https://www.youtube.com/watch?v=K8tMHiX9lSw https://m.youtube.com/watch?v=dxwjPuHIV7I https://vimeo.com/201482507 https://www.youtube.com/watch?v=ZSixqL0iyHw |
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22nd Dec 2018 2:22pm |
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| Sulisuli Member Since: 30 Oct 2016 Location: South west Posts: 4795  
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Dexter I have a genuine lockable fuel cap with the rubber leash and 2 x keys taken off my 2105 XS avalaible for sale if it’s the fuel cap that’s at fault, good luck with solving the problem
 2015 HT XS 90
2008 SVX 90 2000 XS TD5 90 |
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22nd Dec 2018 2:42pm |
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| dexter Member Since: 24 Nov 2016 Location: Winchester Posts: 10 
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I thought about the cap and put a new one on a few weeks ago. Also there is no vacuum build up. A new fuel tank breather was installed sometime ago as the old one was leaking but as there is no vacuum in the tank I assume that the breather is working okay?
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22nd Dec 2018 2:44pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8025  
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Are those symptons from multi drives taking fuel level down or from one journey? Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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22nd Dec 2018 7:13pm |
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| dexter Member Since: 24 Nov 2016 Location: Winchester Posts: 10
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Multiple journeys.
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23rd Dec 2018 4:29pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8025
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so over time you would therefore expect the tank to stabilise.
does sound fuel supply related. not something stupid like sender is giving message for restricted performance thinking tank is too low? sounds like the first option changes/check have already been done. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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23rd Dec 2018 6:58pm |
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