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From: shazzbat on 6 Aug 2010 10:21

"T i m" <news(a)spaced.me.uk> wrote in message
news:j36o565p7rmm9n099j0vims5hrptkm2f5p(a)4ax.com...
> On Fri, 6 Aug 2010 14:39:33 +0100, "jim" <jim(a)nomail.com> wrote:
>
>>If I lift the rear seat, it sounds like the noise (quite a racket) is
>>coming
>>from beneath that. Sounds mechanical.
>>
> No help necessarily but I walked past an AA van trying to start a car
> the other day and he had the rear seat up and was doing something with
> a multimeter in that area. Could he have been checking the feed to a
> fuel pump that may have been underneath the floor in that area?
>
> Cheers, T i m

Well he could, but would that explain the noise described? I think the most
likely fault here is a rubber exhaust hanger has snapped, allowing the
exhaust to hang askew and touch the bodywork or whatever.

Steve

From: T i m on 6 Aug 2010 10:36
On Fri, 6 Aug 2010 15:21:04 +0100, "shazzbat"
<shazzbat(a)spamlessness.fsnet.co.uk> wrote:

>
>"T i m" <news(a)spaced.me.uk> wrote in message
>news:j36o565p7rmm9n099j0vims5hrptkm2f5p(a)4ax.com...
>> On Fri, 6 Aug 2010 14:39:33 +0100, "jim" <jim(a)nomail.com> wrote:
>>
>>>If I lift the rear seat, it sounds like the noise (quite a racket) is
>>>coming
>>>from beneath that. Sounds mechanical.
>>>
>> No help necessarily but I walked past an AA van trying to start a car
>> the other day and he had the rear seat up and was doing something with
>> a multimeter in that area. Could he have been checking the feed to a
>> fuel pump that may have been underneath the floor in that area?
>>
>> Cheers, T i m
>
>Well he could, but would that explain the noise described? I think the most
>likely fault here is a rubber exhaust hanger has snapped, allowing the
>exhaust to hang askew and touch the bodywork or whatever.
>
I was going along with the OP's "If I boot it, it goes away for a
second or two and comes back" and thought that sounded more like (say)
a pump being unloaded for a while (with more fuel use when it was
'booted') then reloading when the system re-pressurises / whatever?
Only a huge guess mind ...

Cheers, T i m
From: jim on 6 Aug 2010 10:40
just had a look. Coming from drivers side rear seat - if I lift the seat I
can hear it clearly. I think that the fuel pump is under there - I'll check
again tomorrow but maybe that needs replacing.

"shazzbat" <shazzbat(a)spamlessness.fsnet.co.uk> wrote in message
news:i3h5on$m41$1(a)news.albasani.net...
>
> "T i m" <news(a)spaced.me.uk> wrote in message
> news:j36o565p7rmm9n099j0vims5hrptkm2f5p(a)4ax.com...
>> On Fri, 6 Aug 2010 14:39:33 +0100, "jim" <jim(a)nomail.com> wrote:
>>
>>>If I lift the rear seat, it sounds like the noise (quite a racket) is
>>>coming
>>>from beneath that. Sounds mechanical.
>>>
>> No help necessarily but I walked past an AA van trying to start a car
>> the other day and he had the rear seat up and was doing something with
>> a multimeter in that area. Could he have been checking the feed to a
>> fuel pump that may have been underneath the floor in that area?
>>
>> Cheers, T i m
>
> Well he could, but would that explain the noise described? I think the
> most likely fault here is a rubber exhaust hanger has snapped, allowing
> the exhaust to hang askew and touch the bodywork or whatever.
>
> Steve

From: Mrcheerful on 6 Aug 2010 11:52
jim wrote:
> just had a look. Coming from drivers side rear seat - if I lift the
> seat I can hear it clearly. I think that the fuel pump is under there
> - I'll check again tomorrow but maybe that needs replacing.
>
> "shazzbat" <shazzbat(a)spamlessness.fsnet.co.uk> wrote in message
> news:i3h5on$m41$1(a)news.albasani.net...
>>
>> "T i m" <news(a)spaced.me.uk> wrote in message
>> news:j36o565p7rmm9n099j0vims5hrptkm2f5p(a)4ax.com...
>>> On Fri, 6 Aug 2010 14:39:33 +0100, "jim" <jim(a)nomail.com> wrote:
>>>
>>>> If I lift the rear seat, it sounds like the noise (quite a racket)
>>>> is coming
>>>> from beneath that. Sounds mechanical.
>>>>
>>> No help necessarily but I walked past an AA van trying to start a
>>> car the other day and he had the rear seat up and was doing
>>> something with a multimeter in that area. Could he have been
>>> checking the feed to a fuel pump that may have been underneath the
>>> floor in that area? Cheers, T i m
>>
>> Well he could, but would that explain the noise described? I think
>> the most likely fault here is a rubber exhaust hanger has snapped,
>> allowing the exhaust to hang askew and touch the bodywork or
>> whatever. Steve

since internal pumps are insulated by the fuel it is rare to hear them at
all. exhaust is first suspect.


From: Mike G on 6 Aug 2010 13:12

"Mrcheerful" <nbkm57(a)hotmail.co.uk> wrote in message
news:2dW6o.64740$Gc2.56018(a)hurricane...
> jim wrote:
>> just had a look. Coming from drivers side rear seat - if I lift the
>> seat I can hear it clearly. I think that the fuel pump is under there
>> - I'll check again tomorrow but maybe that needs replacing.
>>
>> "shazzbat" <shazzbat(a)spamlessness.fsnet.co.uk> wrote in message
>> news:i3h5on$m41$1(a)news.albasani.net...
>>>
>>> "T i m" <news(a)spaced.me.uk> wrote in message
>>> news:j36o565p7rmm9n099j0vims5hrptkm2f5p(a)4ax.com...
>>>> On Fri, 6 Aug 2010 14:39:33 +0100, "jim" <jim(a)nomail.com> wrote:
>>>>
>>>>> If I lift the rear seat, it sounds like the noise (quite a racket)
>>>>> is coming
>>>>> from beneath that. Sounds mechanical.
>>>>>
>>>> No help necessarily but I walked past an AA van trying to start a
>>>> car the other day and he had the rear seat up and was doing
>>>> something with a multimeter in that area. Could he have been
>>>> checking the feed to a fuel pump that may have been underneath the
>>>> floor in that area? Cheers, T i m
>>>
>>> Well he could, but would that explain the noise described? I think
>>> the most likely fault here is a rubber exhaust hanger has snapped,
>>> allowing the exhaust to hang askew and touch the bodywork or
>>> whatever. Steve
>
> since internal pumps are insulated by the fuel it is rare to hear them at
> all. exhaust is first suspect.

I agree. Due to the fact that the noise goes away when the engine is booted.
Probably just needs an exhaust hanger replaced to cure the problem.

When booted the engine will twist slightly in it's mountings. Probably just
enough to move the exhaust away from where it is striking the bodywork, and
then the noise would return as soon as the engine settled back to it's
normal position.

AIUI fuel pumps run at a relatively constant flow rate, with excess fuel
being returned to the tank, so are not affected by throttle position.
Mike.


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