I went through this drill with both vacuum/fuel and fuel only pumps several times. Sometimes the issue was leaking oil, sometimes it was leaking gas, one time it was way too much pressure.
Since the truck is a daily driver, I abandoned the vacuum wipers and the mechanical pump and went electric. No more problem! However, I saved the original pumps and now have several I could have rebuilt should the need arise. I went electric about 2015. In following these threads I see that the problem has not gotten any better. Pumps seem to be the worst. I wonder about water pumps too. I recently installed my last NOS water pump. For my application I have to modify them so they probably are no good as cores. I'd like to have a spare. anyone know a good source for rebuilding water pumps?
