Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 234Get this manual
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DIRECT FUEL INJECTION
NOTE: Apply light coat of 2-4-C wTeflon to diaphragm surface and o-ring to aid in the retention of diaphragm and o-ring on fuel rail during reassembly1 Position diaphragm o