Originally Posted by memento
It’s very hard to succeed at anything if you have a negative attitude. It’s certainly possible that you have a better attitude than you appear to in your posts but you can answer that for yourself. Look at how you titled the thread “My pump is broken” (fail) rather than “My pump is losing pressure” (search for answers to fix).In the US, leluv and LA pump cylinders are good. In the UK and EU thickwall are a good choice. Table Lamp is taking you through the engineering route to solving your problem though. You may not need a new cylinder, you may just need a better seal. What he hasn’t asked and I will is do you know where air is coming in to the cylinder? Is it from the base of the cylinder, the valve area? (this is what Table Lamp is trying to explore with you).
Losing air at the base.