my suspension pump stays on, help!

Hi, just inherited a p38 4.6, when i got it the battery was flat and when i charged it and put it back on I can see why, as the air pump (I think it's that) stays on all the time, I can hear air escaping from the nsf area, is this a common fault? is there a fuse or relay I can pull out to keep the pump off so that I can leave the battery on? and is it supposed to come on before the igbition is on as I would have thought it needed ignition to run??
I hope someone can help please

Pull relay 20 or fuse 40. You obviously have a leak. Should need ignition to be on and engine running.