Re: [doc] Noisy Fuel Pump
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Re: [doc] Noisy Fuel Pump



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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