You could call the EF4000DE the "all-star utility infielder" of the generator field. That's because it does everything well — quietly and efficiently — and still has power in reserve. The heart of the EF4000DE is an all-new 251cc overhead valve engine with a unique combustion chamber design that enhances power output and efficiency. And thanks to its extra-large fuel tank, the EF4000DE can run continuously for 8.5 hours without refueling. Finally, its compact size makes it highly portable. To that you can add the convenience of electric starting. All this makes the EF4000DE perfect as backup power for the home... or a hard worker on the construction site.