Help needed with long range tank

[Nielbd]

Hi Guys

I got this long range tank for my 2001 Hilux.



I need some help with the plumbing. The large pipe in the pic I thought will be the inlet. Where will this be connected to?

Below that, (not visible in pic) is a smaller pipe which I guessed will be the feed pipe to the main tank. Again, where to connect?

Then there's the two fittings that looks like high pressure fittings. These I have no idea of.

Do any one perhaps have the fitting instructions for this tank. Not sure about the brand, think it could be a Frontrunner.

Thanks