What is the maximum distance electric fuel pumps can be located from the engine?

The maximum distance that electric fuel pumps can be located from the engine is indeed 12 inches. This is primarily due to the importance of maintaining adequate fuel pressure and ensuring that the fuel remains in a liquid state to avoid vapor lock. Fuel pumps are designed to push fuel rather than pull it, and if they are too far from the engine, they may not perform effectively. By adhering to the 12-inch maximum distance, you minimize the risk of fuel starvation caused by insufficient pressure, as well as potential issues with vaporization in the fuel line, which can occur if the fuel has to be drawn over a longer distance. Such considerations are critical in marine applications where fuel delivery reliability is essential for safe operation.