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Thread: Fuel Leak

  1. #1
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    Fuel Leak

    Hi,

    My beloved XK8 has developed a fuel leak, somehow fuel is leaking into the boot (taking some black substance with it - probably underseal). The tank sender unit has no trace of fuel round it, the leak appears to be coming from below the tank and is running along the spare wheel well where it is collecting. I don't have the ability to get the car in the air right now but can anyone suggest what I should be looking for when I do or can someone point me in the direction of an exploded diagram of the fuel system?

    Much appreciated

    Fr
    Some people believe football is a matter of life and death, this attitude saddens me; I can assure you it is much, much more important than that!

  2. #2
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    Re: Fuel Leak

    have you checked from filler neck back as it seems a more likely place to leak as the tank is pretty much hidden away for anything to pierce it.hope you find it soon regards richard

  3. #3
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    Re: Fuel Leak

    Hi Richard,

    Thanks I will let my trusty mechanic know on Wednesday when he comes to look at it
    Some people believe football is a matter of life and death, this attitude saddens me; I can assure you it is much, much more important than that!

  4. #4
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    Re: Fuel Leak

    Could be the tank has rusted though,used to be a big problem with xjs`s
    "You know the rules ..... There ain`t none."

  5. #5
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    Re: Fuel Leak

    I'd be surprised as the fuel tank is in the boot (and also looks in A1 condition) but I'm not ruling anything out
    Some people believe football is a matter of life and death, this attitude saddens me; I can assure you it is much, much more important than that!

  6. #6
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    Re: Fuel Leak

    .maybe were the pipes come is .
    "You know the rules ..... There ain`t none."

  7. #7
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    I've had my 2005 model year XKR tank split three times now!

    First time it went into Halfords Autocentres (very local and convenient), they replaced some pipes, fitted some missing (?) seals, gaskets and O-rings, and offered two choices for the split tank

    1. £1100 + vat for a new tank from Jaguar
    2. a cheap fix using a special plastic metal designed for fixing leaking petrol tanks

    Well obviously I chose the second option

    After a couple of months the tank went again, so this time it went into David Marks at Wilford - an excellent reliable Jaguar specialist, who had never come across this problem before

    He fitted a used tank (they don't corrode being inside the boot) and everything was fine - except oddly when brimming the petrol tank the gauge never showed more than about 3/4 full

    Anyway, when driving I had noticed a popping noise from the boot occasionally and thought nothing of it

    After a couple of weeks though the dreaded petrol smell returned and yes the tank had split again

    Back to David Marks who took the tank out again and sent it off to be welded - this fix seemed to last a little longer, perhaps because the weld reinforced to base of the tank?

    You guessed it - tank went again!

    Sent it to Elite And Performance Jaguars in Derby - who, after doing their homework, suggested its probably the Evap System not working

    The Evap System is designed to vent the fumes from the tank when refilling, and capturing them in a carbon filter (under the front wing on my model)

    They replaced the tank (again!), and also the carbon filter, purge valve, various solenoids and what-not, and blew out the pipes

    Now after refilling the tank the gauge shows full - result!!

    When driving home after refilling the tank I would have expected to hear the dreaded popping noise - nothing! Silence!

    Hopefully it's fixed for good this time

    It's fairly logical really when you think about it

    After refuelling the vapours are captured in the carbon filter, then whilst driving the inlet vacuum sucks the fumes from the carbon filter. If that filter is choked, or some valve or other isnt working, then

    a. its impossible to brim the tank when filling because of an air lock
    b. its impossible to suck the fumes from the carbon filter, but the vacuum is instead connected to the fuel tank which flexes
    c. after too many flexes the tank splits

    Time will tell

  8. Thanks P700DEE thanked for this post
  9. #8
    Senior Member frankc's Avatar
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    I too had the clunk noise from the tank. I changed both carbon filters. No problems since.
    2003 Zircon Blue XKR Convertible.
    It's in the detail.

    To see index of "Franks Story" up to 8th March 2017 Please Click Here. Thanks!


    Cannot see any photos? PHOTOBUCKET FIX please CLICK HERE FOR SOLUTION

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