[T3] Fuel Primer.Switch..
Jim Adney
jadney at vwtype3.org
Thu Sep 27 22:14:34 PDT 2018
On 27 Sep 2018 at 20:27, Keith Park wrote:
> the pressure regulators are the same on ALL D jet and available
> everywhere and cheap
The '72-3 Type 3s with EGR actually have a slightly different fuel
pressure regulator. It works exactly the same, but the plumbing is
slightly different.
> the pumps, not so much but Jim gave me a back flow valve years ago
> that worked perfectly when the pumps valve didnt. This also firmed up
> the fuel pressure so its rock steady now, something that is important
> when doing advanced Tuning on D jet.
The check valve should not have any effect on the steadyness of the
fuel pressure, since it's open all the time the pump is running.
Keith's 2 regulators failed in a way that gave him high fuel
pressure. I'm at a loss to explain how that could happen. When I cut
the first of those apart I found nothing in there that could explain
that, no rust, no deposits. It was completely clean. It's bothered me
for years that this could happen, then it happened again. (On the
same car, Keith?)
It makes me wonder if there could be something clogging up the return
line on that car. I don't know what else could cause that kind of
high pressure. If I understand correctly, the pressure rose slowly
above the normal ~30 psi over a period of (days, weeks?) but not as
high as if would have if the pressure regulator had stuck completely
closed, which would be, I think, ~60 psi.
--
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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