that the fuel cell 10 may be constructed to have one or more cell chambers the illustrated hydrogen generator or fuel cell 10 is thus shown as having three fuel cell chambers 10a 10b and 10c the upper end of the fuel cell housing 12 is closed for a cover or closure 14 mounting plates 12a are connected to the housing 12 for providing a means for clamping the hydrogen generator 10 to the frame structure of a vehicle formed in the cover 14 to communicate with the respective chambers 10a 10b and 10c is an inlet 14a closed by a filler cap 14b through which the respective chambers can be charged with an electrolyte the filler cap 14b has a valve in it to compensate for any excess vacuum which is created when the engine in running in accordance with this invention the electrolyte comprises water 15 a catalyst is dispersed in the water 15 the catalyst comprises sodium hydroxide or potassium carbonate as shown in fig1 the partitions 13 are spaced from the bottom of the housing so that the respective chambers 10a 10b 10c are in communication with one another also the bottom of the housing 12 is formed with ribs 12b running longitudinally of the housing 10 the ribs 12b thus enhance the flow of electrolyte from one chamber to the other the arrangement is such that sediment chambers are formed at the bottom of the housing 12 extending into the electrolyte.