A regulator pump comprising: a first fluid chamber; a first inlet valve configured to control a fluid flow into the first fluid chamber; a first outlet valve configured to control the fluid flow out of the first fluid chamber; and a fluid displacement member at least partially bounding the first fluid chamber on a first side of the fluid displacement member and at least partially bounding a working fluid chamber on a second side of the fluid displacement member, the fluid displacement member comprising: a diaphragm at least partially bounding the first fluid chamber; and the fluid displacement member being configured to drive a material downstream through the first outlet valve at a downstream pressure; a status sensor connected to the regulator pump, the status sensor configured to generate a first fill signal based on the volume of material within the first fluid chamber being at a refill volume and to generate a first pump full signal based on the volume of material within the first fluid chamber being at a full volume, wherein the first outlet valve is configured to be in an open position only when the first inlet valve is in a closed position such that the downstream pressure is isolated from and independent of an upstream pressure, wherein the first fluid displacement member is configured to be driven through a forward stroke by a working fluid disposed within the working fluid chamber, characterized by the fluid displacement member further comprising: a shaft connected to and extending rearward of the diaphragm into a shaft bore within a body of the regulator pump; wherein the status sensor is configured to generate the first fill signal and the first pump full signal based at least in part on a position of the shaft and wherein the first fluid displacement member is configured to be driven through a rearward stroke by a fluid pressure of the fluid disposed upstream of the first inlet valve; and wherein the first fluid chamber is fluidly isolated from the working fluid chamber when the first outlet valve is in the open position and the first inlet valve is in the closed position, and the first fluid chamber is fluidly isolated from the working fluid chamber when the first inlet valve is in an open position and the first outlet valve is in a closed position; and the fluid displacement member is configured to drive the material downstream through the first outlet valve to an applicator disposed downstream of the fluid displacement member. a first fluid chamber; a first inlet valve configured to control a fluid flow into the first fluid chamber; a first outlet valve configured to control the fluid flow out of the first fluid chamber; and a fluid displacement member at least partially bounding the first fluid chamber on a first side of the fluid displacement member and at least partially bounding a working fluid chamber on a second side of the fluid displacement member, the fluid displacement member comprising: a diaphragm at least partially bounding the first fluid chamber; and the fluid displacement member being configured to drive a material downstream through the first outlet valve at a downstream pressure; a diaphragm at least partially bounding the first fluid chamber; and the fluid displacement member being configured to drive a material downstream through the first outlet valve at a downstream pressure; a status sensor connected to the regulator pump, the status sensor configured to generate a first fill signal based on the volume of material within the first fluid chamber being at a refill volume and to generate a first pump full signal based on the volume of material within the first fluid chamber being at a full volume, wherein the first outlet valve is configured to be in an open position only when the first inlet valve is in a closed position such that the downstream pressure is isolated from and independent of an upstream pressure, wherein the first fluid displacement member is configured to be driven through a forward stroke by a working fluid disposed within the working fluid chamber, characterized by the fluid displacement member further comprising: a shaft connected to and extending rearward of the diaphragm into a shaft bore within a body of the regulator pump; wherein the status sensor is configured to generate the first fill signal and the first pump full signal based at least in part on a position of the shaft and wherein the first fluid displacement member is configured to be driven through a rearward stroke by a fluid pressure of the fluid disposed upstream of the first inlet valve; and wherein a shaft connected to and extending rearward of the diaphragm into a shaft bore within a body of the regulator pump; wherein the status sensor is configured to generate the first fill signal and the first pump full signal based at least in part on a position of the shaft and wherein the first fluid displacement member is configured to be driven through a rearward stroke by a fluid pressure of the fluid disposed upstream of the first inlet valve; and wherein the first fluid chamber is fluidly isolated from the working fluid chamber when the first outlet valve is in the open position and the first inlet valve is in the closed position, and the first fluid chamber is fluidly isolated from the working fluid chamber when the first inlet valve is in an open position and the first outlet valve is in a closed position; and the fluid displacement member is configured to drive the material downstream through the first outlet valve to an applicator disposed downstream of the fluid displacement member.