I have a problem with the pump of an Optimus 48 which after a few minutes of operation comes out of the tube. I guess there is some pressure going into the tube but how to solve the problem, thanks. Yannick
It will either be: -The internal seal in the pump valve (commonly called the non return valve/NRV 'pip' on this site) hardened or damaged and no longer sealing. -The pump valve to pump tube seal, originally a lead sealing washer which is sometimes absent. Replacement can be lead or thick HDPE plastic -Very much less likely but possible, a crack in the pump tube or leak in the pump tube soldered joint.
