Recently we tried to add HHO to a 12 HP single cylinder diesel engine. The engine appears to use more fuel with HHO than without? We are adding the HHO to the air intake of the engine.

We currently build cells using KOH as electrolyte that generate over a liter a minute at 30 amps and 12 volts. But we have not had any luck with diesel engines. We would like to learn how to make HHO work with small and large diesel engines. Applications are diesel generator sets, fork lifts, earth moving machines, diggers, and trucks.
Appreciate any and all comments that will help us use HHO properly with diesel engines. Regards THM