Yes, fire pumps can operate on alternative fuel sources, though traditional fuels like diesel and electricity are most common. Potential alternative fuel options include:

1. Natural Gas: Fire pumps can be designed to run on natural gas, offering cleaner emissions and cost benefits in some regions.
2. Propane: Similar to natural gas, propane can be used as an alternative fuel, though it requires specialized equipment.
3. Hydrogen: While less common, hydrogen-powered engines are being explored for various applications, including fire pumps, due to their zero emissions.
4. Biofuels: Diesel fire pumps may be adapted to use biofuels, which are renewable and can reduce the environmental impact of running the pump.
5. Solar-Powered Systems: Although uncommon, hybrid systems that use solar power to charge batteries may support smaller fire pumps, particularly in remote areas.