Date: Sun, 3 Jul 2011 17:50:40 -0700
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: Fireworks for the Fourth-in my engine bay
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
true..
you can just crank on the starter while the lines fill.
but why not just energize the fuel lines by cycling the key ?
if that wasn't a useful feature, why would it be built in when you turn on
the key ?
I assume you took the 6mm fuel line ID times Pi D .whatever I am trying to
say - the area of a circle times the 10 feet ( mixing inches and mm, btw )
..
I get 90 cc's myself.
at the hardware store the other day ..
there was some hose or fitting marked as 3/4in OD ..
and 20mm ID.
Insane.
I do consider the lines to get empty some ..
and it's just nice to charge up the fuel lines, filter, etc with fuel under
pressure before going to start it.
I say that is good advice.
it is less 'smart' to go cranking away on empty fuel lines..
and it is smarter to turn the key on, listen for the pump, listen to HOW IT
SOUNDS..
do that a few times.
then go for 'click -vrrroom' .
the idea being also ..
to be as easy on the starter and battery as possible,
and to increase the chances of it starting up easily.
That only makes sense to me !
actually ..it is just 'bad vanagon technique' to hop in, and turn the key
straight to 'start'.
That is why there are quite a few vanagons running without a working oil
pressure light.
no body takes the time to look.
check in the owner's manual..
it says right there..
turn on the key,
check the warning lights,
then start the engine.
common' man.
it's not good technique to crank away when it can be avoided.
if anyone cares about preserving the equipment.
I guess people don't recognize this......
there is a lot that can be learned, just by turning on the key and paying
close attention.
you are not supposed to just turn the key straight to start, not really.
on another note..
What comes to mind when there is strong vibration in the fuel hose just
ahead of the fuel pump on a stock 84 1.9 wbxr with the small square, and
new, fuel filter ..
and the owner says it does that sound only when very full. ?
I have my theories.
and the tank looks original.
and there is a small dent , not bad really, on the forward underside of the
tank right in the middle, left-right wise.
SDF
----- Original Message -----
From: "David Beierl" <dbeierl@attglobal.net>
To: "Scott Daniel - Turbovans" <scottdaniel@turbovans.com>
Cc: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, July 03, 2011 1:32 PM
Subject: Re: Re: Fireworks for the Fourth-in my engine bay
> 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
