With the different methods of fuel injection or how the combustion takes place, you can say that there are pros and cons with all of them. The injectors for example have been noted that due to the hydrogen not having a lubricating effect like diesel or petrol, they have shown wear and tear which will probably be a problem in the long run. Possibly this could be solved with the help of some form of lubrication, or perhaps treating the parts that touch the item with a surface that ensures the friction between them.[1]

 


[1](Gültekin and Ciniviz, 2022)