[T3] Fuel Primer.Switch..

[Keith Park]

THat I didnt know, not living in California :-)

Yes, same car, the first one went in 98, I was on a trip and yea, the car
had been occasionally hard to start when hot for a while, acted flooded, and
on one startup on a trip to N Dakota the kid that was with me was a little
more observant than the average Bear, and noticed that the fuel pressure
went WAY over its set point, were talking 40 to 50psi.  Once started it
would come down, slowly, and remain just a little high but with that changed
out things went back to Normal (this is the one Jim cut open). the second
went this year, just before a trip (naturally) so after seeing pressures
high (high 30's)again, on startup, I changed it out quickly and the
replacement regulated just fine but wouldnt hold pressure after shutdown,
and this is when I started to have to prime the car to get it to re-start
cold. The fuel lines are changed on this car about every 10 years and the
tank was changed out 2 or 3 years ago so it should be clean,

Yea, not sure what would hold it from opening properly except maybe an
excessively stiff diaphragm.

And I do find it amazing that these diaphragms are still servicable after 50
years in Gasoline, ethanol and all!

Keith


> 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.

-- 
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************

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