Try this @
Cuppa
Pulling fuse #24 worked to reset the sub tank warning light. It also resets the odometer, which I was hoping to avoid, but it's certainly easier than removing the negative battery cable.
From this thread "fuel system":
http://www.nissanpatrol.com.au/forum...ad.php?t=46132
This would allow me to reset the warning light, push the switch and have the green light come on and the pump work for 15mins to 1hr.
I haven't invested the time to try to fix mine, so the warning light is still on and I'm not using my sub tank, but I certainly don't need it like you do!