And today I got one just the same, "Gas don't go, haaalp!!!" on an old Hilux, fortunately his petrol system was still working just well enough to get to me. Turned out that the line fuse for the LPG was somewhere under the bonnet, and the holder's lid had fallen off. The fuse had got wet and corroded slightly and there was a tiny bulge in the plastic body of the fuse. So although the fuse was visually intact it wasn't conducting. A new fuse and a bit of pliers love on the holder and the gas sprang back to life. All it took was a methodical approach to the system checking one item at a time.
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