franglais said:

hello, it's really easy to take the tank out, but it's quite involved so allow a half hour or so, and don't worry, no body panels need to come off
you need to jack the right hand side up, take off the wheel, then remove the screws holding on the front wheel liner. just the front part, the one will the louvered grill on it, the liner behind the wheel can stay in place
moving to the top side, there are 3 screws that need removing from the tank itself, (be aware that one of the screws also holds the coolant fluid resevoir in place) if i remember correctly, two are easy to access, but the one near the pump will require a very long screwdriver, very thin hands, or a small socket set extension to reach.
after you have the screws holding the tank out, you can just pull upwards on the pump and it should pop out with no trouble, its not attached by screws, then with a little wiggling the tank will pass DOWN through the hole in the bottom and out through the wheel arch.

upon removing and inspecting the tank you will note that the lug holding the bottom screw in place is rather badly designed, and most of the weight of the tank weighs down on this lug, in my case, there is a hairline crack below this lug which leaks when the reservoir is too full (the hairline crack opens with the weight of the fluid). My tank also leaked and i have made 3 attempts to fix it, first time i tried with a smudge of silicone sealant but i couldn't get the tank clean enough and the silicone wouldn't stick well enough, second time i tried some epoxy glue, but the weight of 5 litres of liquid on this lug proved too much and the glue cracked, 3rd time i used a fiberglass and resin kit to seriously reinforce the lug and to seal the leak. no problems since. touch wood.

EDIT: with hindsight i should have tried to find a brand new replacement tank before using the fibreglass kit, and seeing as yours has been butchered i suggest you do the same.

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