Is it possible to convert fuel energy consumption to electricity consumption?

Household electricity generators use liquid fuel to run the engine and generate electricity.

Given a scenario, If a generator uses 2 litre of diesel per hour, is it possible to find out if that same generator was to run on electricity, how much watt the same generator would have used per hour.

for example take this HONDA GX390 engine.

PS: I have no idea on engineering side, just want to find out if it is possible, if yes, how to calculate.

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