They'll remove the four hole manifold with the float arm attached, free it off and refit.
The problem comes if the tank is a few years old. As with many Italian-made things, it uses a poor grade of metal. The screws holding the manifold to the tank corrode in place and snap off when you try to undo them. Then you either have to drill them out or replace the tank.
Having said that, my log car had a vertical "spare wheel" tank and its gauge was pretty useless, partly because the toroid shape made the fuel level progression uneven, and partly because the float valve was designed for horizontal fitting. I just used the trip recorder. At worst, you had to run on petrol for a while.
I used to get 350 miles from a tank of gas, plus 450 miles on petrol. So I could drive a very long way before needing to refuel. Wish I still had that car!
Last edited by hairydog; 15-11-2018 at 11:23.
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