Date:         Fri, 7 Feb 2003 16:15:37 -0500
Reply-To:     vw4x4 <vw4x4@FYI.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         vw4x4 <vw4x4@FYI.NET>
Subject:      Re: Heater fuel pressure question
Comments: To: David Brodbeck <gull@cyberspace.org>
Content-Type: text/plain; charset=us-ascii

Thanks for all the good info everyone....
   I was figuring mabe a few feet.  Well even 6 feet would put
it outside the Van, witch it not what I want to be doing in
the middle of a snow strom when you need heat. So I guess
I'll have to just find a very small pump....Thanks again.
                               Eric

David Brodbeck wrote:

> On Fri, 7 Feb 2003, Eric Zeno wrote:
>
> > Assuming the fuel has the
> > same weight as water,
>
> Bad assumption.  Gasoline = approx. 6 lbs per gallon.  Water = approx 8
> lbs. per gallon.  (U.S. gallons)
>
> > how high would it have to be?
>
> Reaching back into my fluid power classes...
>
> Pressure (psi) = height (feet) * density (lbs per cubic foot) / 144
>
> Water is 62.4 lbs per cubic foot, so gasoline must be roughly 41.6.
>
> Solving for height...
>
> Pressure * 144 / density = height
>
> So 3 * 144 / 41.6 = 10.4 feet
>
> The bottom of your tank needs to be 10.4 feet above the heater for a
> minimum of 3 psi.  The pressure will be a bit higher with a full tank, but
> not much.  Anyone want to check my math?
>
>              _ _
>   __ _ _   _| | |  | David M. Brodbeck (N8SRE)              Ypsilanti, MI
>  / _` | | | | | |  +-----------------------------------------------------
> | (_| | |_| | | | @ cyberspace.org
>  \__, |\__,_|_|_| "To the optimist, the glass is half full.  To the
>  |___/             pessimist, the glass is half empty.  To the engineer,
>                    the glass is twice as big as it needs to be."