Patrol sub tank

As Mick says, the best source of info about Patrol issues is the patrol 4x4 site.
I'm a little curious to know what you mean by "it pleases itself" when dumping fuel from the sub to the main. Do you mean that it takes a long time to pump fuel across after you have pressed the subtank switch, or that it transfer fuel without you pressing the switch?.

Patrol sub tanks do pump for a couple of minutes every time you turn ignition on and start engine, also sometimes by disconnecting main battery it resets the sub tank switching.
Cheers Mark

Yes it transfers fuel without pressing button

Yes it transfers fuel without pressing button

Les the transfer of fuel in the Patrol is designed as you are experiencing. It will automatically transfer for about 25-30 seconds each time the ignition is turned on. I am informed that this is intended to keep the transfer pump from drying out and/or ceasing - ie the few seconds for fuel going through keep the pump well lubricated.

It will continue transferring until it is empty without touching the switch

OK...if this happens then you have a problem with the transfer switch in the subtank. You might like to check out these discussions for starters:

4WD Action fuel transfer

4WD Action fuel transfer - 2

Nissan Patrol 1

Nissan Patrol 2

Exploroz 1

IH8Mud Forum

These are just a sample of possible sites for more information. You might like to start with a search of this forum (ie Exploroz) as there are 3 or 4 threads on the patol's fuel transfer system. Hope this helps.

When its transferring fuel, is the light on the subtank switch lit?.
If so it is probably a problem with the switch itself.

No the light is not on I am going check earth on weekend thanks everyone for your help