Sub Tank on my GU

[Sir Roofy]

Hi there, I think the sub tank is supposed to hold about 30L, while the main holds about 95L.

Correct me if I'm wrong.

i dont think this is far of the mark 30/95

[beansathome]

All is good and in working order. Once the main tank went down a bit i pressed the button the light and pump came on and started pumping the fuel over. You beauty!!!

Does anyone know how many liters of fuel the stock tanks held?

nice thought u might need to use some fuel to see if it worked. and the tank is ment to hold 25L but when u include the spout it goes u 2 round 30L

[-ET 4wd-]

Yep sub is about 30-35 litres on the wagon and about 80-85 litres in the utes.
Main should be around the 90-ish mark on both.
I have to wait till mine gets to 3/4 before the pump on the sub will work then it will pump the main back to full and switch off.

Steve.

[belzi82]

yeah at the moment nothing happens at all! no light on the switch or the dash. but as i said my main tank is full. But i thought something should at least happen....

When my main tank is full - nothing happens with the sub tank button, maybe try again when you've used a little fuel!

[macca86]

for the first 30 seconds after you start the motor in a diesel and 10 seconds on the petrol the sub tank transfers fuel to the main tank. as above post have mentioned fuel capacities accurately. The sub tank will manually pump fuel over one you have used a 1/4 tank otherwise it faults. If there is a fault in your sub tank the orange sub tank light will stay on after ignition.
run your fuel down and try it at 3/4 full.

[Leighw85]

yeah my sub tank works fine now.
had to run it down a bit.
thanks for everyones input

[the ferret]

I thought the main tank was 100 litres, but you are probably right, either way, it costs a fortune ta fill em both!!
Cheers, the ferret.

[RoBoCoP]

for the first 30 seconds after you start the motor in a diesel and 10 seconds on the petrol the sub tank transfers fuel to the main tank. as above post have mentioned fuel capacities accurately. The sub tank will manually pump fuel over one you have used a 1/4 tank otherwise it faults. If there is a fault in your sub tank the orange sub tank light will stay on after ignition.
run your fuel down and try it at 3/4 full.

Thanks for that macca86. I just bought my first patrol 2.8TD and wondered why my subtank was slowly going down.

On another note i now have a problem with my subtank not working and the dash light being on. I replaced some of the instruement cluster lights with new dimmable LED lights. When I did this the Subtank light came on and has been on ever since. I also noticed that the subtank gauge has not moved since either. Would replacing the instruement lights with LEDs cause this?

[Boofa]

yea all sounds about right, from what i understand there is a level switch which will not allow you to overfill your main tank

[Ben81C]

My sub tank had similar problem after a solid thump to the rear bar going up a nasty little hill climb. I tried everything i could think of. A week later i took it for a swim and it went into limp mode (water somewhere it didn't like) after i dried the electrics under the door seals (which mind you are useless at stopping water) I reset the ECU and presto my sub tank worked again. Stuffed if i could work out why but it worked. Give it a go, worst case scenario you have the same prob and have to reset your radio.