The pump is actually the heart of the sprayer. Pump failure can lead to a lack of pressure and its function. Here are some tips to consider: External leakage: External leakage is usually a sign of a diaphragm being defective or loosening parts and fittings. Pressure Loss: Reducing pressure can be the result of failure and defect in the diaphragm. Excessive vibration: Excessive spraying can be the result of air leakage in the pump suction area.