Re: [doc] Noisy Fuel Pump

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Nick, your misuse of the words "suck" and "pressure" in the same 
sentences really does show a lack of understanding.

At the flow levels we're talking about, and assuming the pickup filter 
is clear, it wouldn't matter if the hose were a mile long if the overall 
height difference was the same.

Martin

Nick Tomlinson wrote:

> fluid dynamics means the actual length of hose makes no difference, 
> only the height?
>
> Are you trying to tell me that if you had a mile of hose twirled in 
> many S shapes that you will require the same suction pressure to cause 
> the lift?
>
> I don't think so.
>
> Maybe the frictional forces, viscosity rating, velocity profile of the 
> circular pipes used in this instance are not taken into account.
>
> http://www.efm.leeds.ac.uk/CIVE/CIVE2400/pipe%20flow2_2.pdf
>
> The reason the fuel pumps are noisy is because they are trying to suck 
> high pressure due to a restriction beyond thier limits.
>
> My fuel pump is v quiet at all temperatures and pumps down to the 
> bottom of the tank (yes, I have checked and then filled the tank with 
> 52 litres of petrol)
>
> NickT.




DOC UK Website: www.deloreans.co.uk
Unsubscribe: doc-uk-unsubscribe@xxxxxxxxxxxxxxx
** Unless otherwise stated, all messages posted to the group are assumed public and may be printed in the club magazine **

---

Yahoo! Groups Links

• To visit your group on the web, go to:
  http://groups.yahoo.com/group/doc-uk/
   
• To unsubscribe from this group, send an email to:
  doc-uk-unsubscribe@xxxxxxxxxxxxxxx
   
• Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.