How many gallons of diesel would br required to run this generator for 24 hours??
assuming the generator is frictionless and converts all the energy of the burning fuel into electricity, you could find the answer by converting the fuel and amps into juels. I think.
Consumption of fuel is actually dependent on the model used so it can vary, your best resource is to get the figures from a manufacturer, take for example the Generac II Emergency Power Systems provide a Diesel Model EPS-8D see link below for full specs: So if we based on this model which consumes 0.88 gallons per hour, running for 24 hours would eat up 21.12 gallons of diesel per generator. As to the amount of current you wish to get that would depend on other set up and implements that you hook to the generator. You may need more than 1 generator to get the total amperage that you are looking for. See the equipment specs.
At what voltage? The ampereage will be different under similar loads at different voltages.