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Boat Repair #3158008
06/30/20 09:42 PM
06/30/20 09:42 PM
Joined: Dec 2009
Posts: 9,515
Trussville
T
toothdoc Offline OP
14 point
toothdoc  Offline OP
14 point
T
Joined: Dec 2009
Posts: 9,515
Trussville
So I’m pretty mechanical, but this one is getting me. 115 Mercury efi 4 stroke. It fires right up, idles fine, gets on plane, may run for 5min or 1min, but then cuts out. I can go back to idle for a minute and same thing, gets on plane and then at some point cuts out.

I’m leaning towards fuel pump or coils going bad. I’ve changed spark plugs, fuel, filters, had the injectors cleaned.

Last edited by toothdoc; 06/30/20 09:54 PM.
Re: Boat Repair [Re: toothdoc] #3158014
06/30/20 09:48 PM
06/30/20 09:48 PM
Joined: Aug 2019
Posts: 1,546
Alabama
R
Red Fox Offline
8 point
Red Fox  Offline
8 point
R
Joined: Aug 2019
Posts: 1,546
Alabama
No boat mechanic but could be a bad fuel line closing up internally.

Re: Boat Repair [Re: toothdoc] #3158017
06/30/20 09:48 PM
06/30/20 09:48 PM
Joined: Mar 2018
Posts: 16,805
Banana Republic
jb20 Offline
Old Mossy Horns
jb20  Offline
Old Mossy Horns
Joined: Mar 2018
Posts: 16,805
Banana Republic
Send it to hevi hes free 🤣


They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
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Re: Boat Repair [Re: toothdoc] #3158019
06/30/20 09:49 PM
06/30/20 09:49 PM
Joined: Jan 2020
Posts: 337
Waverly Hall, Ga
4
4ssss Offline
4 point
4ssss  Offline
4 point
4
Joined: Jan 2020
Posts: 337
Waverly Hall, Ga
You've got crap in the tank. You need to drain it and clean out the gunk.

Re: Boat Repair [Re: 4ssss] #3158022
06/30/20 09:53 PM
06/30/20 09:53 PM
Joined: Dec 2009
Posts: 9,515
Trussville
T
toothdoc Offline OP
14 point
toothdoc  Offline OP
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Trussville
Originally Posted by 4ssss
You've got crap in the tank. You need to drain it and clean out the gunk.

That was my first thought, but how is it getting through the various filters?

Re: Boat Repair [Re: 4ssss] #3158023
06/30/20 09:54 PM
06/30/20 09:54 PM
Joined: Oct 2002
Posts: 18,070
Andalusia, Al. Covington Co.
DEADorALIVE Offline
Old Mossy Horns
DEADorALIVE  Offline
Old Mossy Horns
Joined: Oct 2002
Posts: 18,070
Andalusia, Al. Covington Co.
Originally Posted by 4ssss
You've got crap in the tank. You need to drain it and clean out the gunk.

This, or a filter you haven't found, yet. The pickup or the filter is clogging itself as you draw more fuel...when the engine dies or idles, the sediment falls back out of the filter/pickup until you throttle up again and increase the suction head.


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Re: Boat Repair [Re: DEADorALIVE] #3158024
06/30/20 09:56 PM
06/30/20 09:56 PM
Joined: Dec 2009
Posts: 9,515
Trussville
T
toothdoc Offline OP
14 point
toothdoc  Offline OP
14 point
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Joined: Dec 2009
Posts: 9,515
Trussville
Originally Posted by DEADorALIVE
Originally Posted by 4ssss
You've got crap in the tank. You need to drain it and clean out the gunk.

This, or a filter you haven't found, yet. The pickup or the filter is clogging itself as you draw more fuel...when the engine dies or idles, the sediment falls back out of the filter/pickup until you throttle up again and increase the suction head.

Pickup is a good thought. I have a portable tank. I think I’ll hook it up to it and see if it runs. If so, then I know it’s at the tank.

Re: Boat Repair [Re: toothdoc] #3158029
06/30/20 10:03 PM
06/30/20 10:03 PM
Joined: Apr 2015
Posts: 7,816
North Alabama
Hevishot13 Offline
14 point
Hevishot13  Offline
14 point
Joined: Apr 2015
Posts: 7,816
North Alabama
What year model engine is it?

Re: Boat Repair [Re: toothdoc] #3158034
06/30/20 10:10 PM
06/30/20 10:10 PM
Joined: Feb 2005
Posts: 3,846
Cullman, AL
R
Ryano Offline
10 point
Ryano  Offline
10 point
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Joined: Feb 2005
Posts: 3,846
Cullman, AL
Could it be a crack in the tank or line causing it to suck air? Mine was cracked and had the same symptoms except it was a rough idle most of the time. Plug wires on good?

Re: Boat Repair [Re: toothdoc] #3158037
06/30/20 10:18 PM
06/30/20 10:18 PM
Joined: Mar 2018
Posts: 9,206
Northwest Bama
R
Ridge Life Online content
14 point
Ridge Life  Online Content
14 point
R
Joined: Mar 2018
Posts: 9,206
Northwest Bama
I’d lean toward fuel issue, is it old enough to have prime bubble in line?

Re: Boat Repair [Re: toothdoc] #3158038
06/30/20 10:19 PM
06/30/20 10:19 PM
Joined: Apr 2015
Posts: 7,816
North Alabama
Hevishot13 Offline
14 point
Hevishot13  Offline
14 point
Joined: Apr 2015
Posts: 7,816
North Alabama
A crack in the tank, line, or pickup tube would cause the engine to run worse as the fuel level depleted. Check to see if it has mercury gray fuel line on it. Mercury’s fuel line sucks because the liner of the line falls apart inside and packs into the lift pump.

Does it get worse when turning the engine in either direction?

Does it get worse when you idle a while, or maybe run it hard a while.

Have you had anyone hook a laptop to it? If it’s an ignition issue a laptop should show it.

Sounds most likely like a fuel issue to me.

Re: Boat Repair [Re: Red Fox] #3158070
07/01/20 05:57 AM
07/01/20 05:57 AM
Joined: May 2014
Posts: 269
logan martin
deadeyesdad Offline
4 point
deadeyesdad  Offline
4 point
Joined: May 2014
Posts: 269
logan martin
I’ve had the same issue with my boat a few years ago. Took forever to figure out but it was the inner liner of the main fuel line collapsing and cutting of flow. You couldn’t tell from the outside of the line, but when I was taking the bulb off I could see the loose liner a little way in the line. I changed out all of the lines and it ran great.


"There is no such thing as a failure who keeps trying" John Popper
Re: Boat Repair [Re: toothdoc] #3158074
07/01/20 06:21 AM
07/01/20 06:21 AM
Joined: Dec 2009
Posts: 9,515
Trussville
T
toothdoc Offline OP
14 point
toothdoc  Offline OP
14 point
T
Joined: Dec 2009
Posts: 9,515
Trussville
Thanks guys. It acts like it’s getting air in it or starved for fuel for just a second. It’s jarring when you are running wide open and then it just stops for a second. The first time I thought we hit something. It’s a 2006. It’s irritating because every time you try something, it’s a trip back to the lake for a test run.


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