Not sure where it is exactly on the zinger but on many travel trailers it will be in a space not occupied by a drawer in your kitchen or bedroom or under a false shelf. May even be under the couch if it is a fixed unit. Usually close to the kitchen area. Someone with a unit from that year should chime in soon.
Was it working before or is this unit new to you. If you can't hear it running (obviously the easiest way to find it) then it may be electrical (switch not on, fuse, or relay needs to be reset). Not a lot about the pumps themselves you can repair yourself. Need more info.
2013 CrossRoads Cruiser Patriot CF345RF
2011 Ford F350 Lariat FX4 CC 6.7L Turbo Diesel (Heavily Modified)
Mine is at rear of trailer on the back wall 12-15 feet away from water heater, a good guess would be to check on the interior wall closest to were your filler tube is for your holding tank they are ussually closer to the holding tank.