Virtually all of them will sump at some point, but a week is on the extreme end. Many will do it if left unridden for a long period, most ridden regularly do not do it at all! So it is not normal. Sounds like time to check the seats in the pump and replace the check balls. Robbie
I just had this motor put together by a shop that specializes in Knuckleheads, and they had to replace one gear in the pump, Maybe they did not do everything they shoud have to the pump, this motor had been sitting almost 60 years. Thanks EL Rocky
I would not suggest stretching the spring in order to gain tension. It will only collaspe again because spring tension is tempered in when the spring is freshly manufactured. Most spring steel is manufactured in long length and then cut to standard lengths per application.