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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3932
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I have a 2012 four stroke outboard mercury and rough idled

Customer Question

I have a 2012 four stroke outboard mercury and rough idled then died. When restart rough four about 3/5 seconds then dues
Submitted: 2 years ago.
Category: Boat
Expert:  Charles replied 2 years ago.
Hello, my name is***** will be assisting you today.Would you please post the serial number of the engine?
Customer: replied 2 years ago.
1b928148
Expert:  Charles replied 2 years ago.
Got it thanks.I have a few other questions for you.When was the last time that it ran correctly?Is there a primer bulb in the fuel line?How does the oil look and smell?
Customer: replied 2 years ago.
I ran it this morning for about two hrs just cruising. It's on a pontoon boat
I have only about fifty hrs on it
No primer bulb
Expert:  Charles replied 2 years ago.
What brand of pontoon?Did it do this when you returned to the dock/trailer?
Customer: replied 2 years ago.
I was just moving the boat from the front of my boathouse to the side and rsn it fir about ten mins before putting it in the slip when it started to run rough while I was slowly going to slip.
Once I got. In I tried to restart and would run for five seconds rough and due then aftercyhecthurdvtry if so would not run
Expert:  Charles replied 2 years ago.
You lost me here aftercyhecthurdvtry
Expert:  Charles replied 2 years ago.
When was the last time that you bought fuel?Has the boat been siting for some time?
Customer: replied 2 years ago.
Tw
Customer: replied 2 years ago.
Fourth of july
Customer: replied 2 years ago.
And added marine stabil
Customer: replied 2 years ago.
Oh and then in the slip I tried running it but idle rough for 2-3 secs then fie
Expert:  Charles replied 2 years ago.
How many times has it run since the fourth?
Customer: replied 2 years ago.
None
Customer: replied 2 years ago.
I ran it that weekend for about four hrs
Expert:  Charles replied 2 years ago.
Ok for this you will need a glass jar. Locate the high pressure fuel filter on the left side of the engine. Disconnect the forward most quick connect on that filter. Point the hose into a jar and have a helper turn on the key. Catch the fuel in the jar. Reconnect the hose. Allow the fuel to settle for a few minutes. Is there more than one level in the jar? Or a line in the middle of the liquid?
Customer: replied 2 years ago.
I'll have to do it tomorrow. It's night here and bad storm
Do you think there is water ? Hi much stability? Or trash in the line?
If oil is liwbirvdirty it could do that?
Customer: replied 2 years ago.
Too much stabil?if oil low would it do that?
Expert:  Charles replied 2 years ago.
It sounds like water. That is why I need for you to check it There could be some trash in the filters. Dirty oil will not do it, but having too much oil could.
Expert:  Charles replied 2 years ago.
Stabil should burn ok, low oil pressure would sound the alarm
Customer: replied 2 years ago.
If it's water then what?
Expert:  Charles replied 2 years ago.
You will need to get the boat out of the water and pump the tank
Customer: replied 2 years ago.
It happened once before and after not trying for about twenty mins it started and Ran well this was about six months ago
Expert:  Charles replied 2 years ago.
Still need to test it. This is one of the first things that we do in the shop.
Customer: replied 2 years ago.
I guess I'll need to bring it in to the Mercury dealer
Expert:  Charles replied 2 years ago.
This test you can do right at the house. Even if it is water, you can still get rid of it. Or at least you would know what you are looking at for them.
Customer: replied 2 years ago.
To get rid of it I would empty the tank completely ?
Expert:  Charles replied 2 years ago.
No just pump out the bad stuff. You would need a long hose and a primer bulb, or a small electric pump.
Customer: replied 2 years ago.
I prob have 25 gallons of gas in tank
Expert:  Charles replied 2 years ago.
That is fine. If it is water, it will be on the bottom of the tank. You may only need to take out 5 gal. That is if the problem is water. We don't know that yet.
Customer: replied 2 years ago.
Well thx.
Sorry for all the questions
Have a good night
Expert:  Charles replied 2 years ago.
No problem. Test it and let me know. I will be online for most all day tomorrow.
Customer: replied 2 years ago.
Thx
Expert:  Charles replied 2 years ago.
Your welcome.