main cause your marine engine dying when you place it in
the water is usually because you tried to tune your engine
out of the water.
this "How do I set my needle valves on marine engines?
How many turns out should my needles be set at?"
causes are the tank arrangement. As the boat it propelled
forward the pick up in the tank may be starved for fuel.
All the fuel goes the the rear or stern of the boat from
not only the forward force but also the the bow lifting
without emptying the tank is usually caused from a pin hole
in the fuel line inside the tank.
tear resistance of silicon tubing is very low and it's not
uncommon to develop a hole where the fuel line is assembled
over the edges of brass tubing. If the engine runs well
on the first half of tank and then quits, it's almost always
caused by a hole in the pick up line inside the tank.
the fuel level is higher than the hole in the pick up tube
in the tank the engine will draw fuel through the pick up
tube and the pin hole.
the fuel level drops below the pin hole the engine will
start to draw air. This results in the fuel mixture leaning
out and the engine dying.
tale sign of this are bubbles in the fuel line while the
engine is running with a low level of fuel in the tank.
also cause of erratic