[doc] Noisy Fuel Pump

[Nick Tomlinson <nickandkathryntomlinson@xxxxxxxxxxx>]

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.

Mike Bosworth <mike.bosworth@xxxxxxxxxxxxxx> wrote:
--- In doc-uk@xxxxxxxxxxxxxxx, Martin Gutkowski wrote:
> 
> > (Obviously my new pick up hose is very short )
> 
> As long as the hose itself doesn't collapse (which IS a 
surmountable 
> problem with the original setup) fluid dynamics means the actuial 
length 
> of hose makes no difference, only the height of the pickup compared 
to 
> the base of the pump

What with the 90 degree bend at the top of the hose and the u bend in 
the middle, hence the question mark shape and made out of squezzy 
rubber its no wonder it causes problems.

Maybe a simple length of 'un bent' and more rigid hose swept down 
from the bottom of the pump into the existing baffle position would 
be an advantage, a newer type baffle in this position that doesnt 
need 2 pairs of mickey mouses arms to put together. Might be a good 
project for someone...


            
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