[T3] Fuel Primer.Switch..

[Jim Adney]

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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