New fuel tank - underseal ?

Just about to fit a new fuel tank for my 90. It's painted already, but before I fit it should I underseal the thing. I keep reading about how tight a fit they are and wonder if coating it in thick black stuff before it goes in is just going to make the job worse ?

I left mine standard.
No probs so far.

Thanks for the advice

Left mine also. Although its quite new still, I wouldn't imagine there would be problems for a while.

With the old one out, its a good time to check those hard to reach chassis parts for bad rust. I ended up replacing the tubular outrigggers when I did mine, as they were completely rotten. There was also a bit of chassis patching to do.

Job now done. The old tank was a B to get out and the front bracket was so rusted I'm surprised the tank hadn't ended up lying in the road.

New tank was much easier to get in but I still scratched it in places so I'm pleased I didn't lavish too much effort on undersealing it first.

Oh, and then realised I hadn't left enough room to get one of the bolts for the step back in :doh:

Step??? How short are ya?

I ended up with diesel poisoning doing my tank, what a pain in the ass, if I had to do it again I would certainly paint it with something and seal that little plate on the bottom of it to stop it corroding

Here's what the front bracket looked like !