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A gaseous fuel tank run empty, so the system cannot supply and switches back to petrol or stops. On a bi-fuel vehicle this is usually undramatic — the changeover is automatic and the driver may notice nothing but a fuel gauge and a stored code.

It is worth naming because the codes look like a system fault. Pressure below threshold, insufficient flow, and control faults all appear when the tank is simply empty, and diagnosing them as component failures is a wasted afternoon. Check the tank level before anything else, remembering that gaseous fuel gauges are less accurate than petrol ones and that these tanks are never filled to their full volume by design.

A tank that empties faster than it should is the real fault, and points at a leak or at the system running richer than intended. Repeated empty-tank codes on normal usage should prompt a leak check rather than a conversation about refuelling habits.