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Store Categories Store Categories Other 2PCS For Mercury Opti Fuel Rail Air/Fuel Regulator & Tracker Diaphragm 8M6002988 Product Description Mercury Part #: 8M6002988 & 804533 8M6002988: This diaphragm fits both the air and fuel regulator on all of the Optimax 3.0L Model Engines (200 - 300 HP). Additionally, it is the same diaphragm used for the fuel diaphragm on the Optimax 2.5L Model Engines (135 - 175 HP). This diaphragm is used in either regulator (fuel or air) on the port side fuel rail for...

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