I will give that a try and see how the engine speed varies.
Your note will let me sleep a little better tonight.
By the way, the delivery valve holders were surprisingly cruddy. There were a few spots of corrosion on the outside and some rusty/silty crud on the inside. I attempted to flush it out by manually pumping, but I bet there is a lot more inside the IP.
84 300TD - 235k - Farbe "Surfblau" bought at 213k
87 300SDL - 131k - Farbe "PimpGold" bought at 115k
00 Klepper Faltboot Expedition Double