1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 64Get this manual

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FUEL PUMP DescriptionOperation Th fuel pumps are crankcasc- pressu re-opc ratcddiaphragmtype pumpCrankcase pul sating pressu re (created by the upand-dow moveme nt of cy linde pis ton) is lransfcrrCli

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