Through my related thread on "CIS and Fuel Pressure Distributor Seat" for my 1978 VW Rabbit where I discovered (with the help of others) the control pressure regulator was plugged at its inlet and should be replaced, I found out there were about 60 variations of it by Bosch. Mine ends in a part number of 011, vary basic.
There is a variant that is sensitive to intake manifold pressure during acceleration, thus lowering controlled fuel pressure at the fuel distributor. The plunger raises up to allow enrichment at the barrel slits to the injectors. Within this regulator is an additional diaphragm that drives the rod within the steel pressure chamber. Makes sense to me. Used only during the short time of acceleration.
I trust Butcher and cuppie see this thread with their shop experiences at dealerships. My questions are what part numbers would they recommend if any for my car, how/where would it be mounted in the engine, what cars/engines had this control pressure regulator, were they effective, etc. Appreciate comments from others, too. Thanks.
Are there related threads already started in this regard here at vwvortex?