Is it leaking somewhere into a void or boxed in section? If the pump is running but it's not coming out of the taps that would suggest it's going somewhere else.
Or maybe the hose has become disconnected from the pump in the tank.
If you can get a hand in the tank via the large access bung then grab the pump while its running and tap it hard on the tank side or bottom.
That should dislodge any airlock.
Before that you could remove the pump and see if the impellor is turning with the pump running
They have been known to separate from the motors drive shaft......the shaft turns but the rubber inpellor doesnt.
If its working and tapping it on the tank fails you have a detached hose somewhere.
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