What does the symbol gas pump and 3 drops mean on a ford diesel truck dashboard?

That symbol, a gas pump with three drops underneath, indicates a problem with your Diesel Exhaust Fluid (DEF) system in your Ford diesel truck. Specifically, it means the DEF level is low or there's a problem with the DEF system itself (like a sensor malfunction or a blockage).

You need to address this issue promptly. Driving with low DEF can lead to reduced engine power or even prevent the truck from starting. Check your DEF fluid level and top it off if needed. If topping it off doesn't resolve the warning light, it's time to have your Ford truck inspected by a mechanic to diagnose the underlying problem.