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Onan 12.5 kw fuel pump diaphragm


I have recently purchased a 12.5 kw Onan gasoline generator set from a government online auction. I put new engine oil and filter in it, hooked a fresh battery to it and new gasoline from a clean source. Low and behold the thing started up and ran like a singer sewing machine. The only issue is the fuel pump has a leak where the diaphragm is on the fuel pump. I called the local Onan dealer and he said his information says it is obsolete and no longer available. I'm hoping someone might have a line on some parts. he gave me the Onan part # 149-1787. I'm hoping someone will have a source for parts for this machine. It was built August of 1985