In the same vein as your tank issue, I just recently I had a bit of tentative exploration under my Thunderaces tank. Sorted everything out that I wanted to do and put it all back together, started it up, everything runs fine...
Our lass comes out and says 'Is it working now? Let's go to Squires...'.
So, off we pop.
Need some fuel so head there first.
Been on the road now for like 5mins and I can feel... Something... Like the engine is missing or something... Just occasionally.
By now, we're down two steep hills and nearly into town, and I'm riding with my head to one side listening.
This is before I got my valves gapped, so it wasn't running perfectly anyway, so I thought, maybe I'd just heard that slightly rough running...
We're now through town and turning off past a commercial area to go get fuel and the bike definitely coughs a few times pulling away from the lights!
Hmmm... Not good!
By the time we're on the road leading to Sainsburys petrol station, it's missing a LOT! And I give up and pull over. Only for the engine to instantly die!!! %)£*(%"!!!
Restart it, it fires right up... Then dies!
And again...
And.. Nope, that's it, nothing...
In a mild panic, I come across the only explanation I can think of, I've kinked the fuel line when I put the tank back on, but, there's no way to get to it, unless...
In the commercial area, there's a Halfords, I'm on pretty good terms with them, I wonder if they'll loan me some tools? Worth a try..!
So I'm waiting for the guy to grab me the couple of tools I require to get the tank off when it hits me!!!
I have a tap on the bottom of the tank... I... Didn't... Turn... It... Back... ON!!!
Anyway, 3mins later the bike is fired up and I'm sheepishly explaining what I'd done to the guy that loaned me the tools!!!
You feel SUCH an ass sometimes! lol