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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3398
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I have a 2010 mercury 115 outboard with 49 hours on it and

Customer Question

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: 8 months ago.
Category: Boat
Expert:  Charles replied 8 months ago.

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

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

Customer: replied 8 months ago.
Barely run, we barely made it out of the no wake zone.
Expert:  Charles replied 8 months ago.

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

Customer: replied 8 months ago.
I will get a test kit.
Expert:  Charles replied 8 months ago.

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

Customer: replied 8 months 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: replied 8 months ago.
key up was about 55
Expert:  Charles replied 8 months 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?

Customer: replied 8 months 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
Expert:  Charles replied 8 months 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.

Customer: replied 8 months 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.
Expert:  Charles replied 8 months ago.

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

Customer: replied 8 months ago.
you mean like at a plug connection? if so I do have a power probe
Expert:  Charles replied 8 months 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

Customer: replied 8 months 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.
Expert:  Charles replied 8 months 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.

Customer: replied 8 months ago.
Okay, I will check it and get back to you.
Expert:  Charles replied 8 months ago.

Ok.

Customer: replied 8 months 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
Expert:  Charles replied 8 months ago.

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

Customer: replied 8 months ago.
never, the motor only has 49.1 hours on it
Expert:  Charles replied 8 months ago.

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

Customer: replied 8 months ago.
Okay, so never.
Is there anything to troubleshoot or just replace the impeller?
Expert:  Charles replied 8 months 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.

Customer: replied 8 months ago.
I flushed out the tale-tell hole.
it ran about 5 minutes and then was reaching 180 degrees
Expert:  Charles replied 8 months ago.

Yes, change the impeller.

Customer: replied 8 months ago.
I do not know how and where it is.
Can you help with that?
Customer: replied 8 months ago.
would it be stripped?
Customer: replied 7 months 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.
Expert:  Charles replied 7 months ago.

How low did the pressure get?

Customer: replied 7 months 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: replied 7 months ago.
It dropped and bounced around the 20-25 when running rough and then dropped to 5 when it died
Expert:  Charles replied 7 months 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?

Customer: replied 7 months ago.
https://youtu.be/zs7TyMBgF6c
Customer: replied 7 months ago.
I will try the test from your previous post that I went back to that you mentioned before the water pump issue.
Expert:  Charles replied 7 months ago.

That is the test that I need to know about.

Customer: replied 7 months ago.
did you see the video?
Customer: replied 7 months ago.
The pump kicked on and ran
Expert:  Charles replied 7 months ago.

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

Customer: replied 7 months ago.
Expert:  Charles replied 7 months 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?

Customer: replied 7 months ago.
a little air.
It did not seem open but it was getting through
Expert:  Charles replied 7 months ago.

that was blowing toward the FSM correct?

Customer: replied 7 months ago.
Actually no
I can not get air through it blowing into the FCM
Customer: replied 7 months ago.
I was blowing toward the FCM and I could not blow air thropugh
Expert:  Charles replied 7 months ago.

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

does the oil level seem to raise?

Customer: replied 7 months 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?
Expert:  Charles replied 7 months ago.

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

Customer: replied 7 months ago.
These are the plugs...
WOW!!!!
Expert:  Charles replied 7 months ago.

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

Customer: replied 7 months ago.
It is a little over.
This was done by a marina (Munson Marine in Fox Lake)
Is this the problem?
Expert:  Charles replied 7 months ago.

It can be. does it smell like fuel?

Customer: replied 7 months ago.
a little
Expert:  Charles replied 7 months ago.

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

Customer: replied 7 months ago.
I am not sure
Expert:  Charles replied 7 months ago.

No its closed.

Does the engine run smoother at higher RPM?

Customer: replied 7 months ago.
at first when I first start it up it runs good period.
this is different video.
https://youtu.be/_nPiaDkeRKY
Customer: replied 7 months 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.
Expert:  Charles replied 7 months ago.

Was the water on?

Customer: replied 7 months ago.
I forgot at first but then turned it on.
It runs that way with the water on and running good
Expert:  Charles replied 7 months 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.

Customer: replied 7 months ago.
ok,i will check the line. are you talking about the interior / lining of the hose?
Expert:  Charles replied 7 months ago.

yes.

Customer: replied 7 months ago.
ok. I will let you know
Expert:  Charles replied 7 months ago.

great

Customer: replied 7 months ago.
line looks good, ssoooooo I guess it is the FSM removal...
OK, what now?
Expert:  Charles replied 7 months 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.

Customer: replied 7 months ago.
OK, here are the pics.
There was no particulates in the container, gas was clean.
Pumps look good and the hose is good.
Customer: replied 7 months ago.
I am giving you a run for your money!
Expert:  Charles replied 7 months 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.

Expert:  Charles replied 7 months ago.

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

Customer: replied 7 months ago.
The line looks good and no cracks, the pump sounds good
Expert:  Charles replied 7 months ago.

I would replace the float.

Customer: replied 7 months ago.
ok, how does this one come apart?
Customer: replied 7 months ago.
I got it
Customer: replied 7 months ago.
it sounds good, not soaked or hung up
Customer: replied 7 months ago.
is there a way to test it
Expert:  Charles replied 7 months 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?

Customer: replied 7 months ago.
The FSM was full, the video is bad (sorry)
https://youtu.be/MkOV5XZW4p8
Customer: replied 7 months ago.
I have to get a meter for the resistance
Expert:  Charles replied 7 months ago.

Ok, the pump does sound a bit rough.

Customer: replied 7 months ago.
I had problems with the wire, do you want me to send you a new video with it running for a minute?
Expert:  Charles replied 7 months ago.

Sure. Just to make sure that it is fine.

Customer: replied 7 months ago.
I just don't want to spend money for the float and just to double check before I place an order.
Customer: replied 7 months ago.
https://youtu.be/dEq7uAAE4xg
Expert:  Charles replied 7 months ago.

Sounds ok.

Customer: replied 7 months ago.
what about the oil, plugs and thermostat?
Expert:  Charles replied 7 months 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.

Customer: replied 7 months ago.
how do I clean the injectors?
Expert:  Charles replied 7 months ago.

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

Customer: replied 7 months 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
Expert:  Charles replied 7 months 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.

Customer: replied 7 months ago.
https://youtu.be/DZU8M_Fz-1I
Customer: replied 7 months 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.
Expert:  Charles replied 7 months 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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