At 03:59 PM 7/3/2011, Scott Daniel  - Turbovans wrote:
>this is really 'rich' !
>
>re
>"the difference between atmospheric pressure and
>full regulated line pressure is maybe a teaspoonful "
>
>How can you talk about a pressure difference, and then use a volume
>measurement in your explanation ?

I should have said "the volume difference..."  The lines swell up
under pressure and hold another teaspoonful or so.

>That is not so kosher for such a geek tech guy.
>
>if your point is that it barely takes any pre-running of the fuel
>pump to charge the lines..
>say that.
>and we are not talking about 'pressure' ..
>we are talking about liquid gas in the lines first, or that's what I
>am talking about.

Yes, that's true if you're starting with empty lines, not just with
no pressure.

  If there's ten feet of 6 mm hose in the system that's a volume of
about 85 cc, or about five seconds run on the pump to fill one time.

>so maybe no pre-runs of the pump is enough.
>or maybe only one is.

Since the pump runs continuously as soon as you start cranking I
don't think it makes a material difference whether you do any at
all.  However it's conceivable that a certain amount of air might be
trapped in injectors and have to be worked out through the injector nozzle.

Yours,
David