I have a 4 stroke, 6hp Nissan outboard that stalls out at low RPMs. The cause is an air bubble that grows within the fuel filter. When the bubble gets so large that it only touches the bottom of the filter element, I stall out. At higher RPMs, I also get a bubble in the fuel filter, but it never gets large enough to stall me out. The bubble never goes away. I can squeeze the bulb endlessly and get the bubble to shrink until there is only a sliver of air in the filter. As soon as I quit pumping the bulb, the bubble begins to very slowly grow again. I replaced all the spring clamps with screw clamps in the engine. I've used thread tape where the fuel line screws into its fitting on the the tank. I've also added an additional screw clamp to all the connections on the supply line between the tank and outboard itself. What I have not replaced is the barbed female connector on the engine. Before I go ahead and do this (which seems somewhat complicated due to how the connector is mounted on the engine), am I overlooking something? I also don't understand why the engine doesn't quit as soon as the air bubble touches any part of the filter element. Can anyone educate me about what is going on?
Marc
Marc