Hello all, I just want to put this out there...I was having issues of bogging down at speeds above idle. It was not getting sufficient fuel to keep up. I spent a lot of time and $ replacing parts, rebuilding carbs, and trying to adjust. What I finally discovered was that my triangular fuel pump had a gaskets that were not an exact fit. I'll provide pictures below. Going back several months before my bogging issue began, my motor was surging and I found that my fuel pump diaphragm was old and needed replacing. I went to my local Mercury dealer and obtained a diaphragm kit which consisted of the diaphragm and two gaskets. I did not notice the gasket difference at that time. In hindsight, that's when my bogging issues began. Here are the pics:
This is the fuel pump with no gasket
This is the fuel pump with the first gasket obtained from my Merc dealer
This is the fuel pump with correct gasket
FYI, apparently all triangular fuel pumps made in this time era are not exactly the same. I don't remember the part number of the wrong kit, but the part number of the correct OEM Quicksilver kit is 21-30430A13-B. This kit is actually called a Check Valve Kit.
Happy boating!
This is the fuel pump with no gasket
This is the fuel pump with the first gasket obtained from my Merc dealer
This is the fuel pump with correct gasket
FYI, apparently all triangular fuel pumps made in this time era are not exactly the same. I don't remember the part number of the wrong kit, but the part number of the correct OEM Quicksilver kit is 21-30430A13-B. This kit is actually called a Check Valve Kit.
Happy boating!