Having had 3 mk2 cavs which the fuel tank has rusted out and pi$$ed petrol on ALL of them, I'm quite concerned to hear the mk3's are also prone to failure.
I've got a '95 Cav SRi. Where abouts does the tanks rust first (I've heard that's its on the top, where you cant get to)?
On the mk2's the seams of the tank tended to go (my Lxi rusted at a rubber strip on the seam, used to protect against contact with metal fuel pipes).
My car was in the garage the other day for exhaust work (bl00dy vauxhalls ripped me right off for the proper back box & middle section - should have gone for a performance system) and I noticed rusty bits around the edge of the tank
My thought is to attempt to drop the tank and give it a really good inspection / coat of underbody sealant. What work is involved with this and is it worth doing to keep a 'good' tank good.