Check the listing for details. NEW Mercury 2PCS 8M6002988 1PCS 804533 Fuel Rail Diaphragms. Condition: New. Listed at 338.00 USD. NEW Mercury 2PCS 8M6002988 1PCS 804533 Fuel Rail Diaphragms and Tool kit 889431 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 the 3.0L engines, and for the fuel regulator in the port side rail for the 2.5L engines. The Air/Fuel diaphragm for sale is not the tracker diaphragm that is installed in the starboard fuel rail on either the 2.5L or 3.0L Optimax Engine. This diaphragm is the flat top. Inside with steel balls 804533: The tracker diaphragm is identified by a short knob at the top of the part. The tracker diaphragm that is installed in the starboard fuel rail on either the 2.5L (135 - 175 HP) or 3.0L (200-300 HP) Optimax Engines. 8M6002988: 2PCS 804533;1pcs MYMYCopyright © 2023 Dianxiaomi