Fat-suppressed balanced steady-state free precession (bSSFP) is a rapid imaging sequence often used in cardiovascular MRI. Recently a fast interrupted steady-state (FISS) sequence was proposed which periodically interrupts the steady-state of the bSSFP. The resulting frequency response modulation can be leveraged for suppression of the off-resonant fat signal without the need of fat preparation pulses. FISS was demonstrated for 2D radial acquisitions, however challenges to apply this approach to 3D Cartesian have been reported. Here we propose to extend FISS to 3D Cartesian imaging and investigate its behavior by extended phase graph simulations and in-vivo leg, abdominal measurements.