Fuel pump works but not on the key.

My fuel pump died a few days ago, or so i thought. I was getting underneath to have a look today, but when i connected the pump socket to a battery i can hear it working. but when its connected to the loom and i crank it, nothing.
Where do i start?
V8 defender on SU's, pump in tank.

johndregg said:

My fuel pump died a few days ago, or so i thought. I was getting underneath to have a look today, but when i connected the pump socket to a battery i can hear it working. but when its connected to the loom and i crank it, nothing.
Where do i start?
V8 defender on SU's, pump in tank.

Click to expand...

Hi,
When you say nothing when you are cranking it, do you mean you have no power to it at that moment ?
Because during cranking, it maybe the fuel pump is turned off. If it works with the ignition in the running mode then I would imagine this is correct.
If there is no power going to it at all, I would check the fueses first. If they are ok, check the supply line. It will be ignition live so a supply will come from there.

That was my next question, is the circuit fused? I think the fuel pump must work when its cranking. otherwise how could you start the engine?

johndregg said:

That was my next question, is the circuit fused? I think the fuel pump must work when its cranking. otherwise how could you start the engine?

Click to expand...

With the fuel in the carbs.
To answer your other question, yes I would imagine it is fused and it possibly a relay.

I had this problem mine was loose on the back of the ignition try there happy hunting

Can anyone enlighten me as to the fuel pump relay, fuse? and is there a safety cut out that can be reset?

AFU2913L is the part number for the relay. There are two the same near the ecu - one for the pump, one for the ecu. Fuse should be in same place. Range rover (?) had an impact sensor jobby I think but don't quote me on it.

No ECU on my defender?