| FU | a filter in the fuel line that screens out dirt and rust particles from the fuel |
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| FU | an indicator of the amount of fuel remaining in a vehicle |
| FU | an indicator of the amount of fuel remaining in a vehicle |
| FU | mechanical system to inject atomized fuel directly into the cylinders of an internal-combustion engine |
| FU | mechanical system to inject atomized fuel directly into the cylinders of an internal-combustion engine |
| FU | the amount of fuel remaining |
| FU | a pipe that carries gasoline from a tank to a gasoline engine |
| FU | a petroleum product used for fuel |
| FU | a detachable container of fuel on an airplane |
| FU | equipment in a motor vehicle or aircraft that delivers fuel to the engine |
| FU | supplied with or powered by fuel |
| FU | the activity of supplying or taking on fuel |