Patrol sub tank

Check the earth strap It is a well known problem

Try the Patrol forum for technical advice on these.

hey beegee

From memory the control unit is under the radio behind the heater control panel haven had a problem with mine but have heard the sub tank Relay can play up but unsure where that is situated hope this helps

Scott

Hi Beegee,
I have a 1999 2.8 turbo diesel GU Patrol. I struck the same problem with my sub tank.
I found that the sub tank will not transfer if the main tank is full and disconnecting both terminals from the battery and leaving them off for about 20 minutes reset the sub tank control and it worked perfectly after that

Kev

I had a 1998 2.8 Pootrol and after trying to cross a river the sub tank light came on and stayed on. I couldn't pump fuel from sub into main & was down to zero fuel in main tank. Nissan's stupid system of not being able to drive the vehicle off either or either tank is a pain. Unlike the tojo system which allows the driver to use either tank. Took mine to Nissan dealer & was told it was some type of sensor that detected air or water & shut off. From memory I believe the Pootrol pumps 850ml or similar into the main tank from the sub. This is a design to keep the pump lubricated & active. It happens when you start the vehicle after it has been switched off for awhile. Some Nissan owners also claim great fuel economy but the trick is to fill up the sub & main tank to do the calculation.

I had a similar problem some 2 or 3 years ago, the patrol went to the dealers 3 times and they couldnt fix it, eventually changed the aux fuel pump, $600 for the pump and $600 for all the time they wasted trying to find the fault.. They even had a go at fitting another earth strap, very poory executed attempt i may add. Michael

G'day this is only my 2nd post so I hope it works. I have a 2000 GU Patrol which did exactlly the same thing. There is a control module that initiates a transfer of fuel from the sub to the main tank every time you turn the ignition on. The first time it this issue happened to me I took the car to a dealer who disconnected the module, waited 5 minutes then connected it back and the problem was fixed.
It happened again about a year later, rather than take half the dash apart I disconnected the battery and let it sit over night and that fixed it too, a bit like a cold boot on a computer. It's worth a try.
Bushy

Hi Beegee

Would you mind posting to tell if the battery trick worked, Iam getting a new Patrol this week and would be good to know for the future - thanks :)