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I got a 90 litre tank made and modified the tray (ex rural fire) to fit it at the front. Simple gravity feed to the main tank breather, with electric solenoid and switch in cab for transfer. Probably the most cost effective, no pump to worry about, tank does use up room but it was otherwise unusable as what it used to be (320L water tank). Takes about 45 mins to go from completely empty to full. Works great but I would probably prefer 1 long range tank if I was going to do it again.
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So I still the fuel tank myself.
Took around 3 hours
It is actually surprisingly easy.
I did not even jack the vehicle up
Just drop the factory tank, take off the pump assembly
Put them in ARB fuel tank,
Trolley jack the ARB fuel tank into place
Connect the one electric plug and two fuel line connectors
Drill four holes and bolted it in.
Connect the filler neck.
Job Done...
