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Have tried new oil filter, have flushed motor liquid moly. New oil and filter. buzzer sounds and oil pressure bar flashes on cold start up. 10w30 yamaha oil.

I have a problem. No cold oil pressure. Twin 2003 yamaha F115. I’ve taken out sending unit and put a nipple and connected a clear plastic hose to nipple. Started engine and it took 5-10 seconds for oil to come thru hose. Dealer put in new oil pump, ($3000.00) i can’t afford them guessing. Any...