I'd point out that there is actually no need for killing off the bacteria if you keep the tank free of water... The bacteria can only grow and live at the water-oil interface—no water, no bacteria.
Properly monitoring your tank and draining off any water that does get in is a far better policy than putting UV lights into the tank. UV lights strong enough to actually work through gallons of diesel would suck up a lot of electricity...
I'd also point out that UV light is one of the major causes of asphalt and other petroleum based products breaking down...and that having strong UV lights in your fuel tank may cause the fuel to breakdown faster that it would otherwise.
Properly monitoring your tank and draining off any water that does get in is a far better policy than putting UV lights into the tank. UV lights strong enough to actually work through gallons of diesel would suck up a lot of electricity...
I'd also point out that UV light is one of the major causes of asphalt and other petroleum based products breaking down...and that having strong UV lights in your fuel tank may cause the fuel to breakdown faster that it would otherwise.