by Bryan
(Janesville, WI)
I have a 2012 Mercury 90hp EFI outboard. If it sits overnight I can start it and it will run fine for 15 to 20 minutes at any RPM. then it starts to shutter and eventually stalls. It is hard to start after this unless I let it sit for a very long time or if I release the pressure on the high fuel line. I have purged and cleaned out the gas tank with new fuel, replaced the high and low fuel filters, replaced spark plugs, and checked the screens in the VST with no change in the outcome.
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