One of the major issues that I will be dealing with is a supply of clean fuel.
Sadly because of the inverted horse shoe shape of the tank the right side only fills once the level on the left side reaches the middle and the fuel flows over the middle hump.
Lack of good housekeeping practises with Ferrets result in fuel being orphaned on one side as owners don't change over the fuel tap to draw from the other side. The vehicles in the collection when used get the tap switched over at the half way point in the journey and have the tanks brimmed off for anti-condensation best results.
One of the modifications I would suggest anyone does is to extend the banjo bolt with a small tube brazed or soldered into the centre just to lift the draw point a small way up.
It is shown in drawing form here
http://www.ferret-fv701.co.uk/useful_info.htm quite a ways down the page.
R