Here is a carburetor from an early 2000’s Mercury 4 stroke, that I just had to rebuild. I took these pics with my cell phone standing at the workbench. The owner used ethanol blended fuel and added Sea Foam since the motor was brand new. What I found interesting on this carburetor, was the fact that it has a very fine mesh screen built right into the fuel bowl, [and I do mean fine] thus filtering virtually all debris from entering the carb.
I’m not knocking Sea Foam here… just wanted to share these pics. Needless to say, I have advised him to stay away from the ethanol. BTW, it was very very difficult to get clean. I am keeping my fingers crossed untill I get it back on the motor to see if it will run.
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