1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 31Get this manual

1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 31

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3 Priming pump and fuel hoses Check the priming pump and fuel hoses for cracks or holes, and replace them, as requiredAlso, check the operation of the check valve by blowing in to it Installation