Quote Originally Posted by Shed tuner View Post
pump seal maybe gone hard, wasting air on the pump stroke ?
Sounds a good reason. Will have a look. I know the UK ones had smaller holes in the valve "cotton reel" which reduces the power quite a bit from U.S. spec. I believe there were three different hole sizes for U.S.A. Europe and U.K. market, depending on required energy limits.

Baz