Abstract: A combustion engine electromagnetic energy disruptor includes shaped disruptor carried in an enclosure, and configured to disrupt, distort, and/or agitate electromagnetic energy proximate a combustion engine and fuel system. The disruptor incorporates electromagnetically responsive constituents dispersed in a substantially water-free resin hardened above about Shore D 60 into a predetermined volume and density. The resin and constituents are combined to have a mass ratio of about 50% resin and 50% powdered constituents. A permittivity of the enclosure does not exceed about 3.5, and of the resin and constituents in combination substantially exceeds about 3.5. The resin includes a urethane resin that is mixed prior to curing into a substantially homogenous dispersion with the constituents. The constituents include one or more of piezoelectric, diamagnetic, paramagnetic, ferrimagnetic, and ferromagnetic materials.