From: Jordan on
hippo wrote:

>>> Never seen a starter motor in a fuel tank before, makes you long for the
>>> days of the kick starter.
>>>
>> Well it would make the old trick of a spanner across the solenoid a
>> bit on the spectacular side....
>>
>
> Yes, I was thinking that. You'd certainly start your day with a bang!
>

Q: Why is there no evident problem of fuel pump motor sparking causing
explosions in fuel tanks? Is there no commutator?

Jordan
From: CrazyCam on
Jordan wrote:
> hippo wrote:
>
>>>> Never seen a starter motor in a fuel tank before, makes you long for
>>>> the days of the kick starter.
>>>>
>>> Well it would make the old trick of a spanner across the solenoid a
>>> bit on the spectacular side....
>>>
>>
>> Yes, I was thinking that. You'd certainly start your day with a bang!
>>
>
> Q: Why is there no evident problem of fuel pump motor sparking causing
> explosions in fuel tanks? Is there no commutator?

A spark, fully enveloped in petrol, won't do any harm, but, if the tank
is empty of petrol, but still contained fumes, then, it could be
spectacular.

Maybe that's why the instructions always say stuff about not running out
of fuel? ;-)

regards,
CrazyCam
From: G-S on
Jordan wrote:
> hippo wrote:
>
>>>> Never seen a starter motor in a fuel tank before, makes you long for
>>>> the days of the kick starter.
>>>>
>>> Well it would make the old trick of a spanner across the solenoid a
>>> bit on the spectacular side....
>>>
>>
>> Yes, I was thinking that. You'd certainly start your day with a bang!
>>
>
> Q: Why is there no evident problem of fuel pump motor sparking causing
> explosions in fuel tanks? Is there no commutator?
>
> Jordan

There used to be... the 1977-1978 280E Mercedes Benz had a problem with
it in crashes.

It's what caused my fathers car to catch fire when he crashed (and
several others after release) the design was changed for the next model
and existing ones had the in tank pump altered.

Bit late for him though...


G-S

From: LotsaBitz on
Commodores and many car things have had submerged fuel pumps for donkeys
years.

Don't know how they work, but if the fuel runs low the pump can and will
overheat - its petrol cooled, I kid you not - and stop working. Thats one
reason the owners book suggests not running out of fuel. If it gets to pump
the dregs maybe thats where the dirt comes in.
And changing it involves draining the tank, not too hard in a bike but a
large operation in a tintop.

hth.

-------------

> > Q: Why is there no evident problem of fuel pump motor sparking causing
> > explosions in fuel tanks? Is there no commutator?
>
> A spark, fully enveloped in petrol, won't do any harm, but, if the tank
> is empty of petrol, but still contained fumes, then, it could be
> spectacular.
>
> Maybe that's why the instructions always say stuff about not running out
> of fuel? ;-)
>
>
From: Nev.. on
On 17/04/2010 8:56 PM, LotsaBitz wrote:
> Commodores and many car things have had submerged fuel pumps for donkeys
> years.
>
> Don't know how they work, but if the fuel runs low the pump can and will
> overheat - its petrol cooled, I kid you not - and stop working. Thats one
> reason the owners book suggests not running out of fuel.

Boeing place the main airconditioning units directly under the centre
fuel tanks in passenger aircraft like the 747, using the fuel in the
tank to dissipate the heat.

Nev..
'08 DL1000K8
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