Re: [doc] Noisy Fuel Pump

[Nick Tomlinson <nickandkathryntomlinson@xxxxxxxxxxx>]

Yes Martin I obviously stand corrected. I really do have a lack of understanding of flow, pressure etc and obviously you are correct in every aspect of every subject.

 

I am well aware of the various influences of flow, pressure, pipes etc. If (for example) one ?sucks? on a straw on a drink, it is the atmospheric pressure pressing down on the water surface that pushes the water up the straw due to a low pressure being introduced by the enlargement of the persons lungs.

 

Maybe I should change career from my current one as a consultant to the water industry whereby I perform plant simulation (of flows, pressure, pump control), control system code programming that actually control/ runs water works.

 

I don?t come on here to have an intellectual competition with others but to talk about Deloreans and how to fix/ repair them not jump down peoples throat if they don?t happen to know about something. I don?t claim to know everything either but I would never post half-truths.

 

I apologise to others if this posting appears to be pretentious. I would not normally post my comments in this manner. I wouldn?t want this group to go down to the level of other ?news groups? of trying to out-do each other with individuals ?trying? to look good. I certainly find it quicker to email others off list than end up with ?post-wars?.

 
NickT.

Martin Gutkowski <martin@xxxxxxxxxxxxxx> wrote: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.




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