1962, 40 hp evinrude lark iv

[jmc03021013]

need some ideas, went on vacation last week, after about 3 days, the idle got intermittent. One time it will idle smoothly for a while, then it will slow down a bit and idle roughly. kind of like a surge.Give it a little throttle and then idle it down and it is alright. It also got rather hard to start at times after the idle problems began. To get it to start, I had to increase the throttle to wide open. I recently put a new fuel line and primer bulb.Also after the idle problems started, the bulb would not get hard, it stays kind of squishy.

 

[Paul Moir]

Re: 1962, 40 hp evinrude lark iv

Your '62 should have the old style fuel pump with the glass base. Do you notice air in there?<br />Second question, when the engine is acting up does pumping the primer bulb help (while it's running)?

 

[jmc03021013]

Re: 1962, 40 hp evinrude lark iv

i did not check on air in the glass bowl, but i do have a see through fuel filter within 8 inches of the motor. the filter empties of fuel at wot,(you can still see a bit of fuel flowing through) when the engine is shut down, the filter fills with fuel, i can see air bubbles coming from the engine side of the filter. i squeezed the primer bulb and it did not seem to help. by the way, i rebuilt the fuel pump yesterday. i sucked on the vacuum side and tasted gas, i figured the diaphragm was breached so i rebuilt it. even after repairing the pump, the bulb still feels squishy. note, before i went on vacation, the bulb would get hard. btw, at a real fast idle or at cruising speed, the rough idle and other symptoms go away. by the way, thanks guys