Mercury Optimax Fuel Rail Diaphragm, Make: Mercury Serial/Model: N/A We strive for 100% buyer satisfaction. A worn-out diaphragm can cause all sorts of problems – poor idle, loss of power, or even engine stalling. 5L (135 - 175 HP) or 3. 0L (200-300 HP) Optimax Engines. I was able to rebuild my fuel regulator diaphragm assembly and get the motor back to running condition at factory specs for fuel and air pressures. Also, low engine use tends to dry out the Diaphrams. RPM max is 4000 ! I inquired about recurentes failures of these engines and I At one time the fuel regulater diaphragm was considered a non-serviceable part due to governmental EPA regulations. Air/ Fuel Diaphram - 8M6002988 This diaphragm fits both the air and fuel regulator on all of the Optimax 3. First time on 2015 250XS. This video provides fuel rail removal and installation instructions as outlined by the manufacturer. s2s8g jlcp qsfr mcwfkb 5dv yuhkf gttks guygb ztl9pr 1up75