racer2c
04-14-2008, 04:16 PM
I’ve been helping my sister and her boyfriend troubleshoot an issue they are having with their old 4 cylinder outboard. The engine starts and idles great in and out of the water but underway once on plane it will lose power and stall after about 30 seconds. It always starts right back up again and idles fine.
So, my shadetree mechanic instincts tell me to have them first rebuild the carbs. This engine is 30 years old and they got it from a guy who had it sitting in a field for the last 5 years. Boyfriend put new plugs in and replaced all the fuel lines. He did tell me that they had an issue with the tank vent but he didn’t articulate what exactly that problem is. After doing some reading around the web I’m going to have him check the primer bulb when it stalls to see if it is hard. I’ve read that air getting into the system will cause this problem or also indicate a fuel pump problem although it has no problem with full throttle on earmuffs.
Fuel filters, plugs, starter solenoid, and all fuel lines have been replaced.
Besides rebuilding the carbs and checking the primer bulb, any other suggestions?
So, my shadetree mechanic instincts tell me to have them first rebuild the carbs. This engine is 30 years old and they got it from a guy who had it sitting in a field for the last 5 years. Boyfriend put new plugs in and replaced all the fuel lines. He did tell me that they had an issue with the tank vent but he didn’t articulate what exactly that problem is. After doing some reading around the web I’m going to have him check the primer bulb when it stalls to see if it is hard. I’ve read that air getting into the system will cause this problem or also indicate a fuel pump problem although it has no problem with full throttle on earmuffs.
Fuel filters, plugs, starter solenoid, and all fuel lines have been replaced.
Besides rebuilding the carbs and checking the primer bulb, any other suggestions?