Why does the oil sight glass of the knitted large round surface spray oiling machine not drip oil during use

Why doesn’t the oil sight glass of the spray fuel dispenser drip oil? 1. First, check if the electronic valve is open and if the blown air has entered the fuel tank. 2. Open the oil drum and check whether the three oil distribution pipes inside the drum have fallen off. Third; Fourth: Check if the atomizer is clogged and clean the dirt with an air gun. Inspect the three connected oil pipes to see if they are clogged. For each oil pipe, blow it clean with an air gun. Fifth: Replace the oil nozzles at the connection points of the three oil pipes: For the oil nozzles at the connection points, including the atomizer, approximately five oil nozzles (three plastic hose connection points) need to be replaced. Sixth, replace the atomizer.