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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3843
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I have a Lund boat with a 4 stroke Mercury outboard year

Customer Question

I have a Lund boat with a 4 stroke Mercury outboard year 2012 with low hours.
It runs fine but after running it for 45 min at 3500rpm we stopped for 10 min.
When restarted it and started to take off and it started to sputter and wouldn't run.
After it cooled down for 20 min it restarted and ran fine.
This happened twice.
What could be the cause?
If it has run for 10 minutes it hasn't done this.
Submitted: 1 year ago.
Category: Boat
Expert:  Charles replied 1 year ago.

Hello, my name is***** will assist you.

Expert:  Charles replied 1 year ago.

Would you please post the serial number from the engine? It will start with a number followed by the letter B, then 6 more numbers.

Customer: replied 1 year ago.
8M0042035
ECM0701
X6002IAR
These are 3 numbers I found
Expert:  Charles replied 1 year ago.

'This pic will show you where it is located.

Customer: replied 1 year ago.
I am 35 min from the boat.
I'll have to get back to you.
Expert:  Charles replied 1 year ago.

That is fine. I need to run and grab the kids. I will reply when I get back.

Customer: replied 1 year ago.
There isn't a tag where the picture indicates.
8M0042035 I think is it.
Expert:  Charles replied 1 year ago.

Alright, Ill try and work around that.

Is there a primer bulb in the fuel line?

Is there any work history on the engine that you know of?

Customer: replied 1 year ago.
No primer bulb.
It has less than 100 hours.
No maintenance history
Customer: replied 1 year ago.
The trolling motor has a primer bulb and no problem.
Expert:  Charles replied 1 year ago.

Ok, the 115 does not require a primer bulb. some installers still do not know this, so I have to ask.

Did you get any alarms when the problem happened? Or did the engine just not want to rev up and go?

Has the water pump ever been replaced?

Customer: replied 1 year ago.
No alarms.
No replacement of anything that I know of.
Is there a foot valve on the suction line to the 115.
Expert:  Charles replied 1 year ago.

A foot valve?

Customer: replied 1 year ago.
A device to keep gas at the pump and not let it return to the tank. Check valve in tank.
Expert:  Charles replied 1 year ago.

The way that the boat should be rigged, there would be a pressure valve in the fuel line before the engine. There would also be a anti-siphon valve at the fuel tank. The pressure valve looks like this one.

http://www.attwoodmarine.com/store/product/portable-fuel/fuel-demand-valve

Customer: replied 1 year ago.
I can't see that.
It looks like the fuel line comes into a regulator of some kind 5in x 3in 7 in tall.
Exits to injector tree.
Has a vent line back to air filter and a couple other lines.
Expert:  Charles replied 1 year ago.

That is the fuel service module. The fuel pumps are located inside there. The pressure valve is located in the line from the engine to the boat. It is round and has a hose in and out, it is about 2" tall black with a gray cap.

Customer: replied 1 year ago.
There is only a filter between the boat and the module.
Expert:  Charles replied 1 year ago.

White plastic, located right near the bottom of the inside cowling. I will try and get a different link to the demand valve.

Customer: replied 1 year ago.
The white plastic thing on the fuel line appears to be a filter.
That is just inside the cowling.
Nothing else until it gets to the module.
Expert:  Charles replied 1 year ago.

this would be in the boats fuel line.

What type of boat do you have?

Customer: replied 1 year ago.
Lund
Customer: replied 1 year ago.
I pulled apart high pressure filter and it was under pressure but mostly air came out.
Expert:  Charles replied 1 year ago.

Sorry, it is in the question. This may be located inside the rear of the boat.

When you hit the throttle hard,does the engine function properly?

Customer: replied 1 year ago.
It is fine throttling up.
Expert:  Charles replied 1 year ago.

Just on take off or restarting?

Customer: replied 1 year ago.
After it was ran for 45 min it wouldn't keep running like it was out of fuel.
It cooled for 20 min and tried it again it took 20 sec of cranking then started to take off and ran good at 3/4 throttle.
I got to the boat fame dropped of my buddy to get trailer and ran low speed out a few hundred yards and it quit again.
I then tailored with trolling motor.
Expert:  Charles replied 1 year ago.

Is the boat also a 2012?

Customer: replied 1 year ago.
Sorry I didn't see your reply.
I bought the boat used from a friend.
It is also a 2012.
I had it out a time or two with no problems.
Just 1 mile runs then troll for a while.
Expert:  Charles replied 1 year ago.

Ok, there are a few things that it can be. They are all fuel related and most focus on the boat side of it. I will need you to pull the fuel line from the fitting at the front of the engine, look inside the line to see if it is coming apart, if it is, it will need to be replaced. If it is not, follow it to where it goes into the fuel tank. that fitting is removable, you would need to remove the hose from it, then unscrew the large pick up from the tan top. Lift it up and inspect the tube attached to it. It is can be turned while you are holding the larger fitting, replace the pick up.

Customer: replied 1 year ago.
Is this the line on top of the module or the line attached to the low pressure filter or the line going to the tank as it goes through the motor cowling has a quick connect also. The line that goes into the tank has a squeeze metal ring.
Customer: replied 1 year ago.
The line goes thru the fiberglass housing thru a hole. The tank is visable, it has a line out of it splits in two one to main motor one to trolling motor.
Customer: replied 1 year ago.
The trolling motor side has a quick connect to the motor and a squeeze bulb.
At the time the trolling motor had been used and wasn't disconnected at all and was used for a while as we tried to get back to the dock.
Expert:  Charles replied 1 year ago.

The fuel line is the main one From the boat going to the engine. The engine cowling can remain on while you do this, you do not need to be inside it currently. Also if there is a valve in the line that is going to the trolling engine and it was open, that would allow the big engine to pull air into the system, and run out of gas.

Customer: replied 1 year ago.
I wasn't messing withe the trolling motor line at the time.
I will disconnect lines back to the tank tomorrow after work. About the same time .I'll let you know how it goes.
Expert:  Charles replied 1 year ago.

Thanks. While you are there, could you get a few pics of the fuel lines and the "T" fitting so that I can get a look at the set up? you can post them here.

Customer: replied 12 months ago.
Are you still there?
Customer: replied 12 months ago.
I tried to attach pics.
It wouldn't send.
I'll try smaller files.
Started motor with muffs.
It ran fine.
Got it up to 2400 rpm and started to sputter.
Is this normal?
Customer: replied 12 months ago.
In gear it would revup fine in neutral it was sick at 2400 rpm
Customer: replied 12 months ago.
Expert:  Charles replied 12 months ago.

Earl, I see a pic of the ECU on the engine. I know the engine quite well.

In Neutral, the engine will protect itself and not allow it to run over 2500 RPM, that is totally normal.

Running the engine on a hose does not put much demand on it, so it does not really burn much fuel at all. You could run it all day and it would never really miss.

Customer: replied 12 months ago.
I'm taking it to the lake on Saturday.
I'll run it thru the paces.
I looked at the filters and it don't appear to have any thing in them.
The hoses are tight but at least I feel I can at least troubleshoot it better.
Oh by the way the tag says 2011.
Sorry.
Expert:  Charles replied 12 months ago.

No worries. I still know the engine. Let me know what you see on Sat. I will be on most of the day.

Customer: replied 12 months ago.
Thanks.
Expert:  Charles replied 12 months ago.

Your welcome.

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