Date: Mon, 28 Apr 2014 19:13:40 -0700
Reply-To: Don Hanson <dhanson928@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Don Hanson <dhanson928@GMAIL.COM>
Subject: Re: Digifant question...fuel pump effect?
In-Reply-To: <CAB2RwfhVYeQmdSRMFR=ESRD6GF0m5F2zpRQ206ujo7o5Mhk5nQ@mail.gmail.com>
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Thanks Scott, very good explanation for me. Neil, no dirt or rust in my
fuel tank or pump. I've been dilligent about running some fuel system
cleaner through often and also I use Stabil as a fuel system cleaner after
finding it worked marvelously in my dirt bike tanks and carbs.
I tend to be 'results orientated' when it comes to modifications...Like
even thinking about changing to a more "modern" engine management
system...If someone could show me a motor just like mine that was
significantly more effective with a different injection system, and the
improvement was significant enough to make the changeover expense and
labor worthwhile, then I might have cause to work towards those 'resulting
changes'.. I also tend to follow the "if it ain't broke, don't fix it"
philosophy and also 'leave well enough alone'...I learned early on that
modifying something doesn't necessarily always make it work better.
Chassis dynamometers are the great truth tellers....I had friends in the
racecar world spending thousands of bucks on the latest and greatest mods
only to find they'd actually lost performance or gained maybe 1 or 2 hp for
each thousand they'd spent.....They would have got more for their money
spending that money racing and getting faster driving....enjoying the
vehicle all the while rather than having it apart in the shop and spending
wads of money on it..
I've had Motronic P-cars...They were more powerful than my VW digifant..
But certainly no more reliable..... I consider my Vanagon to be a rather
simple vehicle....I like it like that, because there are fewer things to go
wrong....Manual windows, no 'climate control' no OBD nuthin'....it works
just fine for me...I don't see guys with Motronic motors leaving me in the
dust, I more often see them posting on the boards about false Codes, broken
sensors, how to 'fool' the computer, etc etc...while I am off camping
somewhere in my digifant van...blissfully un-aware of how crude it is to
not have individual sequential injector firing...
Thanks guys...I must be imagining that my motor is working better, mainly
because I no longer hear that pump that sounded like a jet engine spooling
up....
On Mon, Apr 28, 2014 at 5:07 PM, Neil N <musomuso@gmail.com> wrote:
> Don.
>
> Do you suspect there's any amount of dirt in the fuel tank? Did you
> find any dirt in the noisy pump internal screen?
>
> (no. Don't ask why I ask. ;)
>
> Neil.
>
>
>
> On 4/27/14, Don Hanson <dhanson928@gmail.com> wrote:
>
> > My fuel pump has been really noisy for about 1500 miles now and I just
> > replaced it with a new one...A quiet one...
> >
> > Now, with the noisy one, the van ran OK....no glaring issues with
> it's
> > digifant inline four motor....I did 'sense' a slight hesitation as I
> > accelerated from coasting...I think....and sometimes as I went from no
> > throttle to throttle, like at the bottom of a gully, there was a big
> > hesitation, like the motor was OFF for a second or two, then pretty
> normal
> > again...
> > I think this slightly "off" behavior has all gone away with the new
> pump
> > installed..I could be imagining it but the motor seems to run better now.
> >
>
> > ..... But is
> > it possible the noisy pump was making the engine run less perfect?
> > I should know, but how does the digifant fueling system actually work?
> > Could the old noisy pump be supplying inadequate fuel pressure and
> volume,
> > just by a little? It seemed to not matter how much throttle I was
> > using...the van ran fine, but just whining and noisy...
>
> --
> Neil n
>
> Blog: tubaneil.blogspot.ca
>
> '88 Westy http://tinyurl.com/c8rlw6p
>
> '81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/
>
> Vanagon VAG *Gas* inline-VR Engine Swap Group:
>
> http://tinyurl.com/d7gd5ej
>
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