View Full Version : 4.3 mercuiser stall and restart

08-26-2011, 01:01 PM
I have a 2000 4.3 mercruiser, It will fire right up and run for about 5 min. then stall out it will fire right back up and run for about 5 min. and star all over again.I checked the vent line and it's clear. I checked the fuel filter that in the carb. claen. What could this be?

10-05-2011, 11:39 AM
Replace the ICU. My 5.0 did the same thing except it finally would not run in Idle.
I replaced the ICU and that took car of it. ICU is the idle control unit.

10-06-2011, 09:22 AM
So this engine has a carburetor. Did you change the fuel water sep filter not just the screen in the carb? How old is the gas?

10-06-2011, 12:27 PM
Hey Guys, Thank you for responding. I found the problem it was a very simple fix.It was the oil presure safety switch.( located right at the oil sending unit.) It was just slightly dripping at idel. When It would build pressure it would send a signal to the electric fuel pump to shut down. That s Why it would start right back up and start the process all over again. Ben to the lake and She runs Great. Hope that this info can help some one els.