I am a bit out of turn here due to lack of truck engine carb knowledge but if I get your question right you are not sure if the secondary's are opening and thus causing your power problems? On the vacuum secondary Holleys that were used on cars there was a slotted cam and link under the vacuum diaphragm that served to pull the secondarys closed when you let off the throttle. An old hot rodder trick was to put a screw in that slot so the link to the throttle shaft would also jerk the secondarys open mechanically. With no accelerator pump back there it will cause a bit of a stumble whenyou mash the throttle but it will answer your questions as to if they are not opening and causing your problems.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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