Will not start

I left the car parked up for a couple of months so when I went to start it the battery was dead. So jumped started it and parked it back up. So couple of days ago I jumped started it again and left it running took the cables off moved my other car and by the time I got out the car had shut off tried starting it again and nothing. It just sits gurgling. I originally thought it ran out of petrol but wasn’t that. I took the battery out and charged it and still doing the same. I hear the fuel pump turn on and I checked distributor and don’t see blue sparks coming from it, so don’t think it’s that either! It’s fitted with a meta alarm system so I’m thinking maybe it immobilized itself. I’m just not sure what’s wrong with it and because it’s a rare enough car nobody seems to know anything about them.