Battery discharge

Hi all I have a tdi300 with new battery which seems to keep discharging, when testing the Alternator am getting 13.9 ish fast 3000 rpms, question, when I reconnect the battery after charging and before I turn on ignition the fuel pump start's, is this how it should be, or should it only start after turning on ignition, it would seem it's live all the time so could be the reason for battery discharge?

What fuel pump?

I’m assuming the Diesel pump. somthing starts up then stops?

I don't think so... you'd probably have a knackered fuel pump by now... are you sure it isn't JUST the battery?

Is it a late auto?

No I have a number of Good battery’s, I disconnect all leads from the battery, when re connecting a motor starts for a second or two then stops. At this stage I have not turn on any ignition in fact the keys are in my hand. I’ve had the vehicle of 18 months or so and its always been like this. I’m wondering if the vehicle is wire up wrong and connected to a terminal on the ignition key that is always live, I think the pump, if that’s what it is, should only start with ignition ON?

Its a Defender 90 1993 TDI 300.

Should not be anything on other than alarm if fitted unless ignition is on. 1993 will not have a electric lift pump.

Would a sticking relay keep the pump live? I thought the make and brake would be via the key. Please bear with me I'm into vintage vehicles no relays on these.

Question on the 300tdi is the lift pump electrical or machanical? If is the latter then I'm barking up the wrong tree and must be something else that's starting but what?

Lift pump is mechanical on the 300tdi.

Ok. It does sound like an electric motor runs for about 2 to 3 secs then stops this happens as soon as I reconnect the battery and sound like its pumping something up to a pressure then switches off. Could there be an air con unit compressor and if so where is it? Nothing in the cab for air on thought.

Seems like an electrical pump has been fitted incorrectly by someone. Is the mechanical lift pump on the engine?

Have you tested to see how much current is actually getting drawn from the battery, while the ignition is off.

OK an Up date: had the alternator checked out, it's OK, the thing I could hear when reconnect the battery is the radio cd drive, Electrician confirmed the discharge was well within limits only the radio. So the assumption is I'm not using it enough! I must admit it's less than a few miles a day so intend to put a battery conditioner in.

Hahahaha!
CD drive! Brilliant!