Hi, just noticed I’ve got a leak on my fuel tank, small drip from the tank it self, the tank was replaced a few years ago. Before I remove the tank and replace with a new one is there a common fault to check before.
Check all the hoses are tight, check the fuel pipe fittings, and if a 110 (not familiar with a 90) check the seal on the sender unit. if all of these are good then it is likely to be the tank itself that has failed.
I bought a replacement tank for my series 3 some years ago from a well known Landy parts supplier. It was one of the 90 style tanks and not the original spec series tanks so had a seam around the centre. The first time I filled it, I lost half the fuel as the seam had not been sealed so be aware of build issues with aftermarket tanks. And @tottot is right, new tanks come with very little paint on them so you will need to paint the tank yourself unless you buy a nice shiny Ali one!