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A K-Jet does not use what we commonly refer to as a Fuel Pressure Regulator it does use a Control Pressure Regulator or some car lines refer to it as a Warm Up Regulator which is probably a better description of it's function. The CPR is located behind the distributor and under the intake manifold. It should have 2 fuel lines, 2 socket cap screws, and 1 electrical connection going to it. It's function is to regulate the control pressure to the top of the fuel head or the fuel distributor during warm up. For all intents and purposes it is the choke circuit of your K-Jet, it and the 5th injector. To check and see if it is good you need to hook up the fuel guages to it, fire it up so it runs and has good fuel pressure, shut it off and let it cool ALL the way down and then start it from a cold start and document the pressures and how long it takes them to rise and compare them to the specs in the book.
Pointers on replacing it? It is a straightforward, nuts and bolts kind of thing. Remove the dist cap so you have access and undo the fuel lines, do not loose the copper washers that seal the lines, undo the electrical to it, remove the two screws that hold it in and you are done. Some models will be vacuum referenced and if yours is then remove the vacuum lines and draw yourself a diagram first if the underhood one is gone.
Good luck
Mark
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