80 series sub tank

Interesting - the 80 series sub does not fill the main - In fact you drive around on the sub tank just as if it was a normal tank - ie. it is not a filler tank for the main. When you press the sub button it should stay on and you should be driving around with this on until the sub tank is empty.

If the light comes on and then goes off you may find the transfer solenoid is not working correctly. There are two solenoids that handle the change over - one for the fuel supply and one for the return. I have not seen a system where the light comes on and goes off this is very strange hence I would think there is a problem with one of the solenoids.

If you get or have the Gregories manual it will show you how to remove and test the solenoids - I cannot think of another reason for the fault you are reporting.

My sub is a 170 ltr sub with the 90 ltr main I drive around with the sub switched in until it is empty and then drive the main. I know about these solenoids as I had one go in my troopie. I also know they are exactly the same config in the 80 series - I have removed and fully claened and tested the ones in our 80. It is a bit of a bad job (smelly fuel etc) but once done you know how the fuel system works!Regards
ExplorOz Team - David
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Always working, not enough travelling ;-)

Hi guys
Bet you bought a petrol. Mine is aswell and what you have explained is exactly what mine does.
With a diesel 80, one or the other tank can be selected to run off, but the petrol has a computer that will only alow fuel to be pumped into the main from the sub if the main is below 3/4, (and the sub is above empty)
Andrew wheredayathinkwer mike?

so my main tank is too full, is that why the light does not stay on..?

Yes the main is too full. Smart car, it won't overfill the main.
Also bear in mind that EVERY time the engine is started the transfer pump operates for a few seconds which transfers a litre or two to the main. The purpose of this is to keep the pump from seizing or the seals drying out. To ensure the pump doesn't run dry, always keep some fuel in the sub tank.

Regards
NeilLife's too short to say .. "I can't do that !"

My 80 series works the same expect it does not pump any fuel into the main tank on start-up. Sub holds 60 liters and the main 90 liters. I wait for the main to get below 1/4 empty before turning on the sub tank.

Never heard of a 60/90 configuration either. Mine was a 95 litre main and a 50 litre sub (total of 145 litres) before replacing the sub with a 180 litre tank.

Anyone else with something other than a 95/50 config as standard on an 80?