Filler:
If you take an original LR tank then the filler is just under the driver's seat. However I think of modifying the original tank or build a new one with the filler at the rear of the tank. Then modify the standard filler at the back of the vehicle so that I can move the nozzle to fill either the standard or the Aux tank (hate to say this but some Toyo's have that).
This means however, that the diesel inlet for the tank under the driver's seat will be lower than the top of the tank - have to investigate if it would still fill to the top. Think it should - with a decent size breathing pipe. Has anybody input on that?
Pump:
Yes, you would still need a pump. If you have an aux tank in a Td5 you normally pump the diesel into the breathing pipe which goes from the original tank to the filler pipe. As this breathing pipe is higher than the bottom of the Aux tank you would need some sort of a pump system.
However, this does not need to be a pump. In my previous Td5 I attached the breather pipes of the Aux tanks to my air compressor and within a minute or two 60 liters were pumped from the front to the back.


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