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Marti, You filled in several gaps. Thanks. I found the spring under the diaphragm, I didn't know how it functioned as a pressure control system but after you see it, makes sense. It started up tonight without much fuss at all, sits there and idles nicely. I think up north, we would be...

Maybe this might save a bit of grief working on these old mechanical pump systems, maybe not. I am on pump #4 since I got my truck. It was sold with a "bad" pump. I am not driving this on the street yet but I have already bought 3 pumps, make that 2 one was defective out of the box, but maybe...