However , the volumetric weight of hydrogen influences another problem : the quantity of fuel required to increase vehicle range . Retrofitting hydrogen storage could present as the major hurdle in converting fossil fuel cars to hydrogenbased ones . Car makers may also struggle to convert cars to hydrogen that are not factory-fitted with direct fuel injection , which is a suitable form for hydrogen , but very new in the automotive market . Without this type of injection , hydrogen cars run the risk of pre-ignition , presenting as one of the major safety concerns among manufacturers .
So there are certainly some options to be considered for fleet vehicles , particularly as electric and hydrogen conversions are already in research and development , but time will tell whether these options are feasible – at least until the cost of new EVs is reduced .
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