Porbably not if your screws are painted !
As mine where. It only took two hours for me to complete the sender replacement, start to finish, tank in.
Although I have never tried to cut the paint around the screws, and it may well be an easy job with the right tool, I was not willing to take the chance of ruining my paint job.
I was also not willing to leave my screws unpainted. Some do, and that is certainly a builders option, but I did not care for the unfinished appearance. My opinion only.
The other risk you take if your plane was painted post tank install is the very real opportunity to do damage to the ajoining paint on the skins. Paint flows between the skins and can form a bridge that might peel. I would be careful and scribe with a razer knife to make sure I didnt lift any paint if I was going to remove on a painted airplane.
I have removed the tank on an unpainted airplane. The countsunk skins take some grunt to wiggle loose.
That said, I have no doubt it would be quicker and easier to remove the tank for the repair, all things being equal.
Just trying to keep another view out. This is not a difficult job with the tank on.
Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.