Hi, I have an old 4 cyl. 1985/1986 Mercury 50HP, I believe it is the type ELPT. I have recently brought it up to date by replacing failing fuel lines, put in a fuel filter, replacing one of two fuel pump gasket kits and replaced the switch box.
It worked fine this spring, but is now giving me a hard time starting it. When it starts, it's all good and normal, but to get it to start takes too much cranking. I drain the battery too much for each start, and it is simply a bad feeling, not being able to rely on the motor starting when I want it to. Being warm, the motor starts quickly.
I use a bit more than idle throttle, choke, and prime the bulb until hard (requires more than 5 squeezes, though.) After cranking a few times, the bulb is no longer hard. The bulb is new. Usually I sqeeze it again, and repeat this procedure quite a few times until the motor slowly begins to take for it, and finally starts. As it starts, I think it is not raw - it does not smell petrol and it does not smoke much more than normal.
I have been thinking that maybe the choke (or enrichener) valve may not be working properly. The solenoid does - I can hear it clearly. The bulb, however, puzzles me. It obviously pumps petrol, but why it drains so quickly and still the motor seems like it is not getting petrol, is strange.
Any help appreciated.