An electric diaphragm pump comprising: a pump head assembly in a first housing; a motor assembly in a second housing; a fluid sensor; and a leak alert system and/or pump shut-off control system, wherein the first housing is coupled to the second housing wherein the motor assembly is operably connected to the pump head assembly, wherein said pump head assembly includes a seal comprising a diaphragm between a pump chamber and a diaphragm drive chamber, said pump being a single diaphragm pump, wherein the diaphragm drive chamber includes diaphragm drive components configured to drive a pumping motion of the diaphragm, wherein fluid may be pumped through the pump chamber via said pumping motion, wherein the seal is configured to prevent said fluid from leaking out of the pump chamber, wherein the fluid sensor is configured to detect a presence of fluid which has leaked outside of the pump chamber, and wherein the leak alert system is configured to indicate that fluid has been detected by the fluid sensor and wherein the shut-off control system is configured to stop operation of the pump based on fluid being detected by the fluid sensor, characterized in that: the fluid sensor is located within a cavity of the diaphragm drive chamber, said fluid sensor comprises a first probe, a second probe, and a base supporting said first probe and said second probe, said first probe and said second probe are spaced apart by an air gap, wherein the presence of fluid across the air gap creates a conductive path between the first probe and the second probe, and said first probe and said second probe are components of a circuit which activates said leak alert system and/or said shut-off control system. a pump head assembly in a first housing; a motor assembly in a second housing; a fluid sensor; and a leak alert system and/or pump shut-off control system, wherein the first housing is coupled to the second housing wherein the motor assembly is operably connected to the pump head assembly, wherein said pump head assembly includes a seal comprising a diaphragm between a pump chamber and a diaphragm drive chamber, said pump being a single diaphragm pump, wherein the diaphragm drive chamber includes diaphragm drive components configured to drive a pumping motion of the diaphragm, wherein fluid may be pumped through the pump chamber via said pumping motion, wherein the seal is configured to prevent said fluid from leaking out of the pump chamber, wherein the fluid sensor is configured to detect a presence of fluid which has leaked outside of the pump chamber, and wherein the leak alert system is configured to indicate that fluid has been detected by the fluid sensor and wherein the shut-off control system is configured to stop operation of the pump based on fluid being detected by the fluid sensor, characterized in that: the fluid sensor is located within a cavity of the diaphragm drive chamber, said fluid sensor comprises a first probe, a second probe, and a base supporting said first probe and said second probe, said first probe and said second probe are spaced apart by an air gap, wherein the presence of fluid across the air gap creates a conductive path between the first probe and the second probe, and said first probe and said second probe are components of a circuit which activates said leak alert system and/or said shut-off control system. wherein the first housing is coupled to the second housing wherein the motor assembly is operably connected to the pump head assembly, wherein said pump head assembly includes a seal comprising a diaphragm between a pump chamber and a diaphragm drive chamber, said pump being a single diaphragm pump, wherein the diaphragm drive chamber includes diaphragm drive components configured to drive a pumping motion of the diaphragm, wherein fluid may be pumped through the pump chamber via said pumping motion, wherein the seal is configured to prevent said fluid from leaking out of the pump chamber, wherein the fluid sensor is configured to detect a presence of fluid which has leaked outside of the pump chamber, and wherein the leak alert system is configured to indicate that fluid has been detected by the fluid sensor and wherein the shut-off control system is configured to stop operation of the pump based on fluid being detected by the fluid sensor, characterized in that: the fluid sensor is located within a cavity of the diaphragm drive chamber, said fluid sensor comprises a first probe, a second probe, and a base supporting said first probe and said second probe, said first probe and said second probe are spaced apart by an air gap, wherein the presence of fluid across the air gap creates a conductive path between the first probe and the second probe, and said first probe and said second probe are components of a circuit which activates said leak alert system and/or said shut-off control system. the fluid sensor is located within a cavity of the diaphragm drive chamber, said fluid sensor comprises a first probe, a second probe, and a base supporting said first probe and said second probe, said first probe and said second probe are spaced apart by an air gap, wherein the presence of fluid across the air gap creates a conductive path between the first probe and the second probe, and said first probe and said second probe are components of a circuit which activates said leak alert system and/or said shut-off control system.