Mix the fuel in the tank 50 to 1 then remove one of the outlet hoses from the pump to make sure its pumping oil. If it burned down because of the water pump I would not worry about the oil pump. Also if you change the oil filter you can bleed the pump by removing the screw on the top of the pump. any air bubbles will bleed out as the oil runs out, 10 or 15 seconds is plenty,
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