  A quantum engine composed of two oscillators with a non-Hookean coupling is
proposed. Unlike the more common quantum heat engines, the setup introduced
here does not require heat baths as the energy for the operation originates
from measurements. The engine follows the coupling $\rightarrow$ measurement
$\rightarrow$ decoupling $\rightarrow$ extraction cycle. Using a Gaussian term
as a prototypical non-harmonic interaction, it is shown that the fueling
process facilitates the decoupling step. Numerical simulations are used to
demonstrate the measurement-driven fueling, as well as the reduced decoupling
energy.
