Date: Thu, 22 Jan 2009 15:49:20 -0800
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: A question for those smarter than me about Fuel pressure
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hi,
your notion that a larger cross sectional area in one part of the system,
or, in the other case, a restriction at one point in the system, would
affect fuel pressure......
yes, that idea is correct,
but........that's what the fuel pressure regulator does.
it's a 'calibrated restriction' at the end of the fuel rail on the engine,
that also varies a little by intake manifold vacuum.........
so the fuel pressure is determined by what the FP regulator says.
I suppose.......if your 'larger area' was a 10 gallon tank inline with the
fuel rail/hoses.........then the fuel pressure regulator might get confused
or have trouble dealing with that volume of fuel.......
but increasing the cross sectional area of a inch or two of fuel line will
have no affect.
Besides......now you've got 3 hose clamps there.........the two that replace
the firewall plastic part, and the next one about 2 inches forward where it
changes from fuel hose to hard plastic line.
If you just put your engine fuel hose directly to that hard plastic line,
you have ONE hose clamp and connection, not 3.
Which is a better deal of course. ......fewer potential leak spots.
if you're under there sometime, look and see if there isn't two inches of
fuel line going from your just installed part to the hard plastic
line...........I just go straight to that line, with the hose from the
engine..
Scott
www.turbovans.com
----- Original Message -----
From: "Jeff Lincoln" <magikvw@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, January 22, 2009 6:39 AM
Subject: A question for those smarter than me about Fuel pressure
> Hello list -
>
> Here is my question - it may seem a bit silly but I really don't know the
> answer.
>
> Some of you may recall that a couple of weeks ago I had an issue with a
> bad
> fuel line. So I replaced said line from the pump to the plastic firewall
> fitting - while I was at it I removed that plastic POS and replaced it
> with
> a brass coupler with a 5/16 barbed fitting on each end.
>
> My question is this: That brass fitting clearly has a bit larger of a
> diameter on the inside than the stock plastic fitting. So my twisted
> little
> mind was wondering if that additional "space" could cause a change (drop)
> in
> fuel pressure? If it does would it be enough of a difference to notice in
> the way the bus runs or fuel consumption?
>
> Like I said I could be off base with my little theory but I thought I'd
> ask
> those of you who could tell me if I'm nuts or not.
>
> --
> Thanks,
>
> Jeff
> '90 Carat (Grover)
> '86 (We call this one Parts)
> '78 Bus (Melissa) Patty's Bus
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