I am not sure what it is called exactly, but I am referring to the mechanism that pumps oil from the reservoir to the engines. I wanted to ask if anyone knows how to test if the mechanism is working or if it even pumps oil to the engines. I might be completely wrong on my understanding of how oil is delivered from the reservoir to the engines. If there is a sending unit how can i test if it is working to make sure that my engine is receiving oil. Any advice would be great thanks Mike. 1997 seadoo speedster.