Update time, will try and get this to where I am now over the next few days.
With the tank out and before I put it back in I turned my attentions to the rear diff. This needed its oil changing as I had no clue when it was last changed and had a feeling it was topped up with anything lying around as it seemed to have a leak on the pinion shaft... Which appeared to be a red fluid. I'm guessing transmission fluid.
Because of the way the car has been built I can't get the rear cover off the diff without removing the whole thing from the car.. So spanners out again and got the diff out.
Diff out I could now remove the rear cover, also realised that the fill plug was rounded and so out with the welder to weld a nut onto it so I could turn it out
Knowing this won't be the last time I'll need to change the oil I set about fitting a drain plug
Wasn't happy with just letting the rubber 'o' ring squash against the casing as it wasn't totally flat at the point. So of to my machining friend who managed to mill a flat area and even a small recess for the rubber 'o' ring to make sure it wasn't going to leak.
Gave it all a clean and bolted back up again - some of you may notice the odd nuts on the diff mount and the old standard diff mount, the rear beam and everything is due to come out again at some point to be overhauled so new nuts, mount, bushes and everything else will be done then.
At this point I was keeping my fingers crossed that the pinion seal was leaking due to the transmission fluid and that with the correct oil I would get lucky and it would be OK. Only time would tell.
With that done time to get the tank all bolted up and fitted. Gave it a very very quick polish just to make it look like one block colour.
Tidied the original sender unit as best I could before fitting
Fitted the breather and sender unit and then one last shot of new vs old!
Tank fully fitted
With that done it was filled up with some fuel and of on a test drive.
More to follow soon.