WUR/CPR was Re: [urq] Parts recommendations

[Ben Swann]

This clarifies a bit:

The cold engine acceleration enrichment system is complicated. There is a
pressure differential diaphragm inside the control pressure regulator which
also alters the control pressure (the main control is the bimetal strip).
The two vacuum lines are connected to each side of this diaphragm. Under low
load conditions both sides are drawn to the same vacuum by the fat hose.
Under high loads, the fat hose loses its vacuum, raising pressure on its
side of the diaphragm - however the other side stays at high vacuum due to
the one way valve going to it. Once the engine has warmed up, the thermo
switch opens allowing the vacuum to drop on the small lines side as well.
Hence, while the engine is cold, enrichment under load depends on the small
lines between the thermo switch, the one way valve, and the control pressure
regulator maintaining low pressure conditions.

>From Huw's diagram.

It seems to me that theas per factory plumbing for the UrQ is just not
right.  Huw's layout makes more sense.  Just need to figure the best way to
apply this info. to using positive pressure.