Sub tank only pumps to main when switch pressed.

[FatBoyzInc]

Having just moved from a '99 GU II to a 2012 model I noticed a change in the way that the sub tank pump operates. In the old car, the transfer pump operated for a short period every time the car was started, and must have been setup to transfer fuel periodically based on the level in the main tank. Effectively, If I never touched the Sub tank switch and simply kept driving the sub and main tanks would both be close to empty at the same time. In the new one, the transfer pump only operates if I press the switch. As I always keep both tanks full, if I don't remember to run the transfer pump every once in a while, I could end up with a sub tank full of stale fuel. Is this normal, or is there maybe something wrong with my car.

[MudRunnerTD]

I alway fill both tanks at the same time, press the Odometer, drive until the fuel light comes on and take note of the fuel range then press the transfer pump and pump out the sub and again drive to the fuel light and have a clear understanding of my fuel range and how the car is running based on consistent fuel economy.

Yes the transfer pump pums till empty. It take considerable time to transfer.

The fuel light works a treat mate, no need to carry an Extra 30lts in the sub unless you going to use it between each fill. If there is a possibility of it going stale I don't see the point carrying it to be honest. I use it every time. Saves me having to stop for fuel.

[Winnie]

Does diesel go stale like petrol does?

[FatBoyzInc]

Thanks Mudrunner,

I use it every time too, but just think it silly that they ditched the automatic transfer feature. I also wonder why the 2.8 came with a fan under the intercooler but they didn't put it on any thing else.

[FatBoyzInc]

Does diesel go stale like petrol does?

Diesel left too long can develop algae. I don't know how long, too long is though.

[MEGOMONSTER]

Yes the button must be pressed to transfer the fuel.
I have a long ranger sub tank and always empty both tanks to constantly empty both out just like Darren in post above.

[Maxhead]

Thanks Mudrunner,

I use it every time too, but just think it silly that they ditched the automatic transfer feature..

They still transfer a little at each start-up to keep the seals lubricated

[threedogs]

I have the same routine as MR taking note of Ks travelled I think its 590 till the light comes on.
Like Mego I turfed the pissy 35ltr sub tank and fitted a 75 ltr Brown Davis sub, one of my better mods IMO.
drain them both all the time .

[happygu]

Diesel left too long can develop algae. I don't know how long, too long is though.

Always keep your Sub Tank as full as you can, especially if you aren't using it for a while, as this helps to prevent algae growth.

Mic

[FatBoyzInc]

Thanks for the replies, might look at a long range tank before we do the Cape trip. Just need to work out how I can make the business pay for it instead of coming out of my own pocket.