1. After the pump has filled the tank it correctly stops at 10 bar, this drops to 9.8 bar in say 10 mins and then stays there (in an unheated garage). Is this the hot air just cooling and contracting? 2. When the pump starts it seems to partially exhaust for a few seconds of running and then seals completely .. is this normal? I.e. a partial delay to let the pump get going? 3. How long should a B2800B 3 HP 12 cfm pump take to fill a 50L tank from empty? apologies for the daft questions, just had a few issues like a faulty leaking PCL air filter and a leaking QR connector; so one starts to question things. Life has taught me to check things out when you first get them, because if you don’t sort things out quickly, after getting new stuff ... many suppliers are pretty unhelpful.