A posting quoting the Discovery Workshop manual's description of the anti-trickle fill valve. Could this valve's malfunction prevent filling the tank?
...from the Workshop manual...
A vent line flow restrictor known as an anti-trickle fill valve is fitted to the filler pipe in the line between the tank and EVAP canister. The function of this valve is to prevent overfilling the tank by trickling fuel in, thereby preserving the vapour space in the tank to allow for fuel expansion during hot weather.
The valve achieves this by blocking the vent line during the fuel filling process. The valve is operated by the action of inserting the filler gun so that when the fuel in the tank reaches the level of the filling breather, flow cut off occurs due to fuel filling the filler pipe.
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