2Pcs Fuel Rail Air/Regulator Diaphragm Replacement for Mercury Optimax 3.0L Engine 8M6002988 00501393OEM Part Number 8M6002988 804533 Fit For the Following Models Replacement For Mercury Optimax 3. 0L Model Engines (200 300 HP), Fits both the air and fuel regulator Additionally, it is the same diaphragm used for the fuel diaphragm on the O ptimax 2. 5L Model Engines (135 175 HP). This diaphragm is used in either regulator (fuel or air) on the port side fuel rail for the 3. 0L engines, and for the fuel regulator in the port side rail for the 2. 5L
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