Date: Tue, 3 Apr 2007 19:31:30 -0700
Reply-To: GMac999 <gmac999@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: GMac999 <gmac999@YAHOO.COM>
Subject: Re: Surging between 1700 and 3000 rpm
Content-Type: text/plain; charset=iso-8859-1
I've seen those on "auto-regulating" fuel pumps. They automatically
adjust
pressure based on outside air pressure. They will lower the pressure
at
elevation and raise it at sea level.
GregM
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On
Behalf Of
mordo
Sent: Tuesday, April 03, 2007 9:19 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Surging between 1700 and 3000 rpm
I did not know that about that kind of filter. I didn't run the
number of
this Purolator filter but I know Purolator specs one for the 2.1
vanagon.
I don't think it's sealer that is the goo simply because i have the
PO's
receipt for the tank replacement and it's about two years old. The
tank
still has a clean, shiny finish on the outside. I suppose it could be
reconditioned.
With that regulator-like device on the output end it compels me to do
an
output test to make sure I'm getting the appropriate flow even witha
clean
filter.
On 4/3/07, Dennis <d23haynes57@hotmail.com> wrote:
>
> That fuel filter is designed for a carbureted application. Not
> designed for the flow of a recirculation FI system. That and the
goo
> resulted in the element collapsing. That pump looks like maybe it
> belongs inside a fuel tank, not external. The goo is interesting.
Maybe a
fuel tank sealer.
>
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On
> Behalf Of mordo
> Sent: Tuesday, April 03, 2007 8:53 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Surging between 1700 and 3000 rpm
>
> I haven't corrected this problem yet due to a lack of appropriately
> sized fuel line at my FLAPS, but the photos at this link is
certainly
> evidence of the problem being a restricted filter:
>
> http://picasaweb.google.com/mmordo
>
> Check out the sassy, cobbled-together fuel pump rig I'm running.
The
> filter was before the pump. I beleive it is what the FLAPS calls
out
> in as spec'd in the Purolator brand.
>
> What do we think the goo is? It looks waxy and very much like
> something you don't want in your fuel system.
>
> There appears to be some sort of pressure regulator on the outbound
end.
> Is
> this typical of the OEM pump? I suspect not. I wonder what vehicle
> it's intended for?
>
>
> ---------- Forwarded message ----------
> From: mordo <helmut.blong@gmail.com>
> Date: Mar 31, 2007 12:15 PM
> Subject: Surging between 1700 and 3000 rpm
> To: vanagon@gerry.vanagon.com
>
>
> I'm bumping this post in hopes for some diagnostic help.
>
> I thinkn calling this condition "surging" was inaccurate on my
part.
> It is actually just momentary loss of power.
>
> The condition presents with the engine warm, and the engine under
> load. I have tested fuel pressure at the T and it is at spec.
>
> I am thinking that the throttle valve switch is a possible culprit.
My
> question now is what is "full throttle"? If the switch is defective
or
> misadjusted, would the switch out of adjustment cause this
momentary
> dying condition under full throttle?
>
> I've just checked continuity and adjustment of the TVS and it
appears
> to function properly. Given where the throttle is when the the
swithc
> closes for full throttle, I would guess that the TVS is not related
to
> this power loss. The throttle valve is open to its stop when the
switch
closes.
>
> To recap:
>
>
> - 2.1L wbx with Vanagon syndrome harness installed
> - Idles fine
> - Under load, at about 1500-1700 rpm, the egnine dies and then
revs up
> to about 3000 rpm. Dies, revs. Dies, revs.
> - If I hold the throttle steady it does this very consistently
>
> I'm at a loss. Any ideas?
>
> Thanks,
>
> mordo
>
>
> ---------- Forwarded message ----------
> From: mordo <helmut.blong@gmail.com>
> Date: Mar 25, 2007 4:31 PM
> Subject: Surging between 1700 and 3000 rpm
> To: vanagon@gerry.vanagon.com
>
>
> I just went out for a drive, the third short trip of the day. The
van
> ran fine the first two trips except on a fairly steep grade near my
> house. On this grade, the engine loses power and drops to about
1500
> rpm. By feathering the throttle, I could get it to rev up again and
get me
home.
>
> This third trip, the engine consistenly surged between abot 1700
and
> 3000 rpm at about 25-30 mph. This is an automatic 2.1L wbx.
Feathering
> the throttle seemed to have little positive effect. Accelerate from
a
> stop and rev up to about 3k rpm - it dies and drops to about 1700
rom
> and then it goes right back up to about 3000rpm. A moment later, it
> drops back to 1700 rpm and so on.
>
> I would be willing to believe it is a clogged fuel filter but why
> would the surging be so consistent?
>
> The engine idles fine. The engine is warm, not full on hot.
>
> I checked the fuel pump wiring before this trip. A good wiggle on
all
> connections did not produce any negative effects. The fuel filter
is a
> clear plastic, round filter in frotn of the pump. It seems to have
> some strange muck at the bottom side of the filter.
>
> Any lucid insights, list?
>
> --
> mordo
> 1990 Carat
>
>
> --
> mordo
> 1990 Carat
>
> --
> mordo
> 1990 Carat
>
--
mordo
1990 Carat
____________________________________________________________________________________
Don't pick lemons.
See all the new 2007 cars at Yahoo! Autos.
http://autos.yahoo.com/new_cars.html
