Any chance the pump got turned over so the suction side is now connected to the valve?
Or there is a leak in the suction line allowing air in the pump instead of drawing up oil.
If the pump is mounted above the oil level in the tank, it may be necessary to relieve the pressure upstream of the pump. Try loosening one of the cylinder lines, hold the valve as if extending the cylinder with the loose line while running the engine at fast speed. Be ready to release the valve, it will get messy!
Some gently applied air pressure (rag around a blow gun in the fill neck) will push oil to the running pump.
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