PAYMENT ON DELIVERY FOR THIS Firman Eco10990ES generator is a fuel powered generator with a relatively large tank capacity of 28.5 liters. It is fuel efficient, consuming less fuel to keep it running for as long as ten hours and above nonstop in a full tank. Its tank comes with a meter displaying how much fuel is contained in it just to avoid sudden exhaustion of fuel. A fuel filter is also packaged with it which filters foreign object from getting into the tank compartment, ensuring that only clear fuel gets into the tank.