My pumps are both black Mark. Yeah I was thinking that I may as well get a new one and get it over with. The pump will work on the bench in a jar, so maybe you're right, it's not getting enough back and forth motion on the saw.
PWE 545036801ASM-OIL PUMP 9.29
Far as I know this is the latest part # for that pump, but you might want to check by your type #