I’m in a bit of a quandry–
My “new to me” pseudo-rebuilt 2004 Johnson/suzuki 140 has a habit of losing power at cruise from time to time. The problem seems to be related to fuel delivery. It’ll be running along just fine at speed (3500-4500 rpm) and it bogs down to idle, and sometimes it will die completely. If I pump the primer bulb when it happens it always regains it’s vigor right away. It does not happen on a perfectly regular basis, but usually acts up at least once or twice when I am out on the water. I figured I was “sucking air” somewhere. So far to attempt to fix the problem I’ve found and fixed small leaks at by fuel/water seperator, new seperator element, replaced my primer bulb with a OEM BRP bulb, replaced my low-pressure fuel pump, replace the under-cowl fuel filter, replace my anti-siphon valve at the tank and re-teflon-taped all the fittings. The main fuel line is 3/8" and is only a few years old; it’s heavy-duty marine fuel hose.
The motor has a OMC fuel connector on the front (not hard-lined in). I’m going to replace the fuel lines under the cowl, but I’m just about at a loss… any suggestions? Sound familiar? Thanks in advance.