Mercury Optimax 75, 90, 115, DFI starting year 2004 service manual., Page 249Get this manual

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DIRECT FUEL INJECTION

aAir pressure gauge should indicate 648.1 13.8 kPa (94 psi)Fuel pressure gauge should indicate 744.6 13.8 kPa (108 psi)Air pressure test valveFuel pressure test valv

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