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Old October 31st 04, 01:18 AM
Matt Whiting
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Thomas Moats wrote:

> "Matt Whiting" > wrote in message
> ...
>
>>Thomas Moats wrote:
>>
>>
>>>"Full_Name" > wrote in message
...
>>>
>>>
>>>>On Fri, 29 Oct 2004 23:00:03 +0200 (CEST), Nomen Nescio
> wrote:
>>>>
>>>>
>>>>
>>>>>Have you all observed that not one automobile has a drain valve installed
>>>>>to the fuel tank?
>>>>><snip>
>>>
>>>
>>>Most diesel tanks do. Most diesel engines also have water separators

>
> somewhere
>
>>>in the fuel system. There is a physical difference between gasoline and

>
> diesel
>
>>>fuel as to why.

>>
>>Actually, their isn't. Water doesn't mix with either.

>
>
> Your correct, water does not mix in either. Diesel does not evaporate like
> gasoline which is the physical difference I was referring, and the fuel systems
> are not required by law to have an closed evaporative system like gasoline tanks
> have. Because of this most if not all diesel tanks are exposed to large amounts
> of outside atmosphere which contains water which condenses in the tank.


But that isn't the reason that diesels take water in the fuel much more
seriously. The reason is that diesels have very high pressure injector
pumps. These pumps operate with very tight tolerances and any water
that gets into them is very likely to cause instantaneous failure of a
very expensive piece of hardware. That is why diesel engines have much
better filtration sytems (dirt is as bad as water obviously) and take
extreme measures to keep water out of the injector pump.


Matt

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