I have a 2012 115 optimax pro xs. It’s a 3 cylinder so it only has 1 fuel rail. A lot of the info I’ve found online regarding tracker and fuel regulators is for the 6 cylinder with 2 rails.
In the attached photo can anyone clarify if the top valve is the tracker or fuel regulator? I thought it was the tracker but when I pulled the original diaphragm it looked like the fuel pressure ones (has the little center ball that rotates)
Edit ( photo rotated, valve on left is the one I thought was the tracker)