Fuel pump questions

[Kevin Vannorsdel]

The man speaks truth...

The PRESSURE at the bottom of a H2O tower has nothing to do with the volume of
water suspended...  it is simply

P= Pa + (rho)gH   where

Pa = atmospheric pressure
rho = density of H2O
g    = acceleration of gravity
H   = verticle column heigth.

This assumes that the fluid is in-compressible...


I admit---  it "seems" not right at first....
________________________________________________
  Kevin Vannorsdel     IBM Arm Electronics Development
    408-256-6492                Tie 276-6492     kv at us.ibm.com




owner-diy_efi at efi332.eng.ohio-state.edu on 12/09/97 01:06:44 PM
Please respond to diy_efi at efi332.eng.ohio-state.edu @ internet
To: diy_efi at efi332.eng.ohio-state.edu @ internet
cc:
Subject: Re: Fuel pump questions


> The return line pressure is based on the vertical distance the fuel
> is pumped, not the weight of fuel in the tank.  So there would be
> more pressure if the fuel were returned to the top of the tank .
> Most gas tanks are lower than the high point of the system so the
> return line is down hill.
>
> Bob McKnight phx az


So you mean to tell me that you can just as easily pump water up a 3/8"
pipe 75' straight up and into the bottom of a water tower and that 3/8"
line will have LESS pressure on it than the same line going to the top
of the water tower and dripping in through the top?  I've been wrong
before, but I really don't think this is right.

If you put the fuel return line into the bottom of the tank, wouldn't
that be just like pinching the line and creating more pressure?  Or the
same as using a smaller fuel line diameter?

Please do explain to me as i don't really understand this i guess...

--
Andy Quaas
p.s. !!!!NO FLAMES INTENDED!!!!