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I have a 2010 mercury 115 outboard with 49 hours on it and

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it has sat for the...
i have a 2010 mercury 115 outboard with 49 hours on it and it has sat for the last two years. I took it out and it ran like crap and kept quiting. I changed the fuel, plugs and added seafoam and lucas injector cleaner. took it back out and still did the same thing.
Submitted: 1 year ago.Category: Boat
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Answered in 9 minutes by:
7/19/2016
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 4,047
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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Hello, my name is***** will assist you.

About how long and at what RPM would the engine run?

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Customer reply replied 1 year ago
Barely run, we barely made it out of the no wake zone.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, can you test the fuel pressure that is going to the fuel rail?

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Customer reply replied 1 year ago
I will get a test kit.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Great, let me know what you get at key up. Lets the pumps finish their run, and you should have a good reading.

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Customer reply replied 1 year ago
It was running about 45 at idle and went to about 52 not running but with pressure.
could not run ling because I was not getting water to spray out.
I tried flushing it.
Customer reply replied 1 year ago
key up was about 55
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, when you had the boat out, how long could you run before it cut out?

Is there a primer bulb in the fuel line?

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Customer reply replied 1 year ago
couldn't run it, have it in a barrel.
no primer bulb.
couldn't run it long because now the water is not spitting out
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

When you had it out the other day. Would it run for a few minutes, a few seconds?

Have you made sure that there is not any water in the fuel tank?

Remove the primer bulb. This engine does not need one, it can cause problems on this engine.

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Customer reply replied 1 year ago
I have no primer bulb.
a couple of minutes, just to get past the no wake zone.
I emptied the tank and refilled with new fuel and treatment.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, do you have a way to apply 12V DC to a socket to do a test on the low pressure fuel pump?

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Customer reply replied 1 year ago
you mean like at a plug connection? if so I do have a power probe
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Yes, the 6 wire plug going to the FSM on the front of the engine controls the fuel pumps. Apply 12V positive to the Orange and 12V negative to the Brown. Part 1 is this harness. You should hear a pump run.

http://www.boats.net/parts/search/Merc2/Mercury/115%20EFI%20%284-STROKE%29/1B366823%20%26%20Up/Fuel%20Supply%20Module/parts.html

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Customer reply replied 1 year ago
When I hit the key you can hear the pump kick in.
Do I still need to check it?
Also, I need to troubleshoot the water not spitting out and the temperature going up.
when it did run good there was no problem and then you can start hearing a suction sound and then it ran rough and then stopped running.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

There are two pumps located inside that housing, we know that the high pressure is running, you have pressure, but we do not know about the one that draws fuel from the tank.

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Customer reply replied 1 year ago
Okay, I will check it and get back to you.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok.

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Customer reply replied 1 year ago
I could use some help with the water pump not working.
it is not spitting out and the motor gets hot quick.
Thank you
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Sure, when was the last time that it was replaced?

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Customer reply replied 1 year ago
never, the motor only has 49.1 hours on it
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

But the engine is 6 yrs old.. Spec is every 300 hrs OR 3 yrs, whichever comes first.

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Customer reply replied 1 year ago
Okay, so never.
Is there anything to troubleshoot or just replace the impeller?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Well not having water flow, is a good indication, but you could also have a plugged tale-tell hole. Yet, that water flow does not come from the block, it comes from the FSM. And the engine overheating is another indication.

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Customer reply replied 1 year ago
I flushed out the tale-tell hole.
it ran about 5 minutes and then was reaching 180 degrees
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Yes, change the impeller.

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Customer reply replied 1 year ago
I do not know how and where it is.
Can you help with that?
Customer reply replied 1 year ago
would it be stripped?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
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Customer reply replied 1 year ago
OK
I have replaced my water pump and is working good.
NOW, I have the issue with it running bad.
I hooked up the fuel test gauge and it was at 45psi, then it started running like crap and the pressure dropped as it was running rough. I am not sure if it is the low pressure fuel lift not getting it to the high pressure fuel pump or just the high pressure fuel pump failing.
I ran it about 15 minutes before it started acting up (got warm).
I took a video and I will try to attach it and send it to you.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

How low did the pressure get?

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Customer reply replied 1 year ago
bounced around but dropped. I tried to send the video and even changed the file type.
Anyway, the idle and rpm's kinda reflected the fuel pressure.
If I an send you either an email or text for about a 25 second video please let me know.
Customer reply replied 1 year ago
It dropped and bounced around the 20-25 when running rough and then dropped to 5 when it died
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

For the vid, if you could post it to a file sharing site, like youtube, you could send me the link.

We are going to need to test the lift pump, do you have a way to supply 12V to the connector for the pump?

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Customer reply replied 1 year ago
https://youtu.be/zs7TyMBgF6c
Customer reply replied 1 year ago
I will try the test from your previous post that I went back to that you mentioned before the water pump issue.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

That is the test that I need to know about.

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Customer reply replied 1 year ago
did you see the video?
Customer reply replied 1 year ago
The pump kicked on and ran
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Yes, I saw the vid. you have already unplugged the connector and tested the pump?

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Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

ok, Locate the hose on the top of the FSM that does not have a quick connect. Follow it to the intake, remove it there. Then try to blow into it. Can you move any air through it?

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Customer reply replied 1 year ago
a little air.
It did not seem open but it was getting through
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

that was blowing toward the FSM correct?

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Customer reply replied 1 year ago
Actually no
I can not get air through it blowing into the FCM
Customer reply replied 1 year ago
I was blowing toward the FCM and I could not blow air thropugh
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, that is good. How do the plugs on the engine look?

does the oil level seem to raise?

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Customer reply replied 1 year ago
I replaced the plugs, replaced the fuel and put in seafoam when I first was having the problems. I took it back out and was doing the same thing.
I then brought it home and contacted you and then replaced the water pump and then this is where we are.
Should I check the plugs again? They don't have but about an hour of run/ start time.
Not sure about the oil level...... It is good and I was going to change it again after all this just because it got hot. Other than that how should I check the oil?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Yes inspect the plugs. I would like to know if any of them are fouled now.

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Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Check your oil level. Make sure that it is not overfull.

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Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

It can be. does it smell like fuel?

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Customer reply replied 1 year ago
a little
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, check the thermostat and make sure that it is not stuck open.

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Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

No its closed.

Does the engine run smoother at higher RPM?

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Customer reply replied 1 year ago
at first when I first start it up it runs good period.
this is different video.
https://youtu.be/_nPiaDkeRKY
Customer reply replied 1 year ago
what happens is the motor either runs good or it don't. If I have it at a higher rpm it still just starts to bog down like the previous video where it starts to shake and then dies, high or low rpm.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Was the water on?

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Customer reply replied 1 year ago
I forgot at first but then turned it on.
It runs that way with the water on and running good
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

ok, it is running out of fuel. Make sure that the fuel line from the boat to the engine, is not coming apart on the inside. if that is still good, the FSM will need to be removed and opened up.

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Customer reply replied 1 year ago
ok,i will check the line. are you talking about the interior / lining of the hose?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

yes.

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Customer reply replied 1 year ago
ok. I will let you know
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

great

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Customer reply replied 1 year ago
line looks good, ssoooooo I guess it is the FSM removal...
OK, what now?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Remove it and open it up.. Make sure that the pump filters are clear and that the small hose inside it is not broken.

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Customer reply replied 1 year ago
I am giving you a run for your money!
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

How is the hose there. Move it slightly to see if it is cracked. The float looks to be an older one. It could be the issue. There have been several design changes on it.

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Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

While it is apart, test the low pressure pump again. Make sure that it sounds like it is running full speed.

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Customer reply replied 1 year ago
The line looks good and no cracks, the pump sounds good
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

I would replace the float.

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Customer reply replied 1 year ago
ok, how does this one come apart?
Customer reply replied 1 year ago
I got it
Customer reply replied 1 year ago
it sounds good, not soaked or hung up
Customer reply replied 1 year ago
is there a way to test it
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Using resistance. Measure between the pins, thru the float upside down and right side up, the reading should change.. How much fuel was in the FSM when you opened it?

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Customer reply replied 1 year ago
The FSM was full, the video is bad (sorry)
https://youtu.be/MkOV5XZW4p8
Customer reply replied 1 year ago
I have to get a meter for the resistance
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, the pump does sound a bit rough.

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Customer reply replied 1 year ago
I had problems with the wire, do you want me to send you a new video with it running for a minute?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Sure. Just to make sure that it is fine.

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Customer reply replied 1 year ago
I just don't want to spend money for the float and just to double check before I place an order.
Customer reply replied 1 year ago
https://youtu.be/dEq7uAAE4xg
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Sounds ok.

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Customer reply replied 1 year ago
what about the oil, plugs and thermostat?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Clean the plugs, the oil needs to be changed, the T-stat is ok. With the engine sitting, I would have the injectors cleaned as well.

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Customer reply replied 1 year ago
how do I clean the injectors?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Remove them and take them to a shop that cleans injectors.

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Customer reply replied 1 year ago
I am not sure on how to test the float, I have a multimeter and I am not getting anything on any of the settings.
Thank you
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Set the meter to read resistance. that is the Omega symbol. Use a low scale, place the meter leads to the pins in the float connector. Hold them there as you turn the float from ride side up, to upside down. The reading is supposed to change.

If you need to, send me a pic of the meter.

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Customer reply replied 1 year ago
https://youtu.be/DZU8M_Fz-1I
Customer reply replied 1 year ago
I assume that this is bad so I had ordered one off of boats.net.
I will let you know when I get it and when I have everything back installed.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

The reading should have changed. Sounds like it is stuck in one position electrically, even though it is moving on the inside.

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Charles
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 4,047
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Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.

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