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#12817526 - 07/05/18 05:52 PM Motor cuts out 90 hp Mercury 4 stroke
obiewan57 Offline
Extreme Angler

Registered: 02/24/03
Posts: 1682
Loc: College Station, Texas, USA
I put it in the shop... had service done, oil, oil filter, lower unit serviced, fuel filter, plugs checked.
Computer hooked up with no codes showing up.

Burned fuel down to 1/4 tank, filled tank, in order to have as few
Additives in gas as possible...had recently ran Seafoam and Heet
In previous couple of tanks.

Today would run about 3 miles at 30+ mph when motor would start cutting out,
If throttle increased it would cut out worse, if reduced to 18 mph, no cutting out...or, if throttle moved to
Neutral for just 10 seconds, motor would run like 3 more miles before cutting out...move to neutral
Again for 10 seconds, good for another long run.

Emptied water seperater filter before last fill up, could see about three tiny drops of water
In jar. So, added one bottle of Heet to current
Tank of fuel.
_________________________
Weldon Kirk
www.FISHTALES-GUIDESERVICE.COM LET'S GO FISHING
Davy Crockett said, Be sure you are right, then go ahead!


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#12817618 - 07/05/18 07:32 PM Re: Motor cuts out 90 hp Mercury 4 stroke [Re: obiewan57]
lil minner Offline
Green Horn

Registered: 08/07/15
Posts: 9
Loc: Texas, Louisiana
Try checking the fuel lines. Start at the tank and work your way toward the engine. I have seen pin hole leaks in every part of the fuel line and they all cause similar problems. It's usually the primer bulb or the quick connect fittings. Hope this helps.
_________________________
The only rules that matter are Murphy's.

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#12817678 - 07/05/18 08:20 PM Re: Motor cuts out 90 hp Mercury 4 stroke [Re: obiewan57]
obiewan57 Offline
Extreme Angler

Registered: 02/24/03
Posts: 1682
Loc: College Station, Texas, USA
Forgot to mention there is a 19 gallon tank and I run through 12-15
Gallons per week

Three year old motor


Edited by obiewan57 (07/05/18 08:21 PM)
_________________________
Weldon Kirk
www.FISHTALES-GUIDESERVICE.COM LET'S GO FISHING
Davy Crockett said, Be sure you are right, then go ahead!


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#12817707 - 07/05/18 08:45 PM Re: Motor cuts out 90 hp Mercury 4 stroke [Re: obiewan57]
Topwater2 Offline
Pro Angler

Registered: 03/06/14
Posts: 817
Sounds like a fuel line problem to me. Maybe collapsing inside, a pin hole or...... just not picking up enough fuel at high RPM's. Hope its a simple fix.
_________________________
FishKen

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#12817888 - 07/05/18 11:08 PM Re: Motor cuts out 90 hp Mercury 4 stroke [Re: obiewan57]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11452
Loc: Littlefield Tx & Lake A. H. US...
Check the fuel line going the coupler at the front of the cowling. Have been seeing a lot of problems with the grey fuel line on these Mercs. The 4 strokes are also having a lot of problems with the float in the fuel supply module. Some it is necessary to replace the complete fuel module. Have also had problems with the fuel demand valve between the tank and the motor.
_________________________
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD

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#12818508 - 07/06/18 02:08 PM Re: Motor cuts out 90 hp Mercury 4 stroke [Re: obiewan57]
obiewan57 Offline
Extreme Angler

Registered: 02/24/03
Posts: 1682
Loc: College Station, Texas, USA
Today

Ran 3 miles at 30+ mph
Fished
Ran 2 miles
Fished
Ran 2 miles
Fished
Ran 2 miles fished
Ran 3 miles to marina

Never cut out
_________________________
Weldon Kirk
www.FISHTALES-GUIDESERVICE.COM LET'S GO FISHING
Davy Crockett said, Be sure you are right, then go ahead!


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#12828837 - 07/15/18 06:18 AM Re: Motor cuts out 90 hp Mercury 4 stroke [Re: obiewan57]
obiewan57 Offline
Extreme Angler

Registered: 02/24/03
Posts: 1682
Loc: College Station, Texas, USA
Thanks to everyone for your help.

I ended up cutting out until I used gas level down to less than a quarter.
Filling tank diluted any fuel additives I might had built up in the tank.
Then, only additive I put in was Heet.

I then ran three days in a row with no motor problems. Added more gas to tank and have now run three more days with no problem. Hopefully fuel was the only problem.

Thanks again
_________________________
Weldon Kirk
www.FISHTALES-GUIDESERVICE.COM LET'S GO FISHING
Davy Crockett said, Be sure you are right, then go ahead!


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