I'd just about bet that there is either a hole in the diaphragm, or an air leak in the pipe between the pump and the inlet manifold. sounds exactly like the rack is going in too far and not returning unless you pull the stop. the rack must be free by the sound of it, but it seems that the vacuum system is not pulling the rack back. Pull the diaphragm right out and have a good look at it. plus make sure that the diaphragm is seating nicely in the chamber on clean surfaces. All the best, Rex
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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