It may be a better option to replace all the fuel lines, the perfect opportunity once the tank is out.
Okay thanks for the advice!
For the rubber fuel lines (5/16) it should be quite easy, but for the steel lines I don't have the kit required, so it could be done later after the corona crisis when I'll get the car to my mechanic for an intensive check-up, and for all the repairs that I can't achieve by myself
I think I have a good amount of mechanical knowledge but it's mainly theoretical, I don't have many practical experience (other than for basic operations like oil changes, brakes, and bodywork as it's supposed to be my profession)
But the 300 is my chance to improve my skills
Anyway, all the best with your car, as for your English, it's good, interacting with native speakers like those on the forum will improve it, but there's nothing too much wrong (if anything) now.
Ahah happy to know that!
Like you said this car and this forum are a good reason and opportunity to get better!