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I have a 1996 115hp evinrude that sputters over 4000 rpm.

Customer Question
wondering what the problem is...
I have a 1996 115hp evinrude that sputters over 4000 rpm. wondering what the problem is and if I can tackle myself?
Submitted: 2 years ago.Category: Boat
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Customer reply replied 2 years ago
Motor may be the 1997 model - can check when I get home.
Answered in 6 minutes by:
7/15/2015
Marine Mechanic: Tan, MerCruiser Certified Technician replied 2 years ago
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,091
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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Hello. My name is***** post the engine model number then we know for sure what you have.This could be an ignition issue or a fuel issue. We can eliminate the fuel issue fairly easily. If it turns out to be an ignition issue it can get complicated. To check for a fuel related issue run the boat till it starts acting up push the choke in does the engine run better? If no change while engine is acting up squeeze the primer bulb does the engine run better? To find a misfire at high rpms we will need a timing light and another to drive the boat while checking for a misfire while engine is acting up. Can you do the fuel system checks? Do you have a timing light?
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Customer reply replied 2 years ago
I can do fuel system checks but don't currently have a timing light - used to though.
Marine Mechanic: Tan, MerCruiser Certified Technician replied 2 years ago
Ok lets go ahead with the fuel checks at least we can eliminate this as a possible issue. Post back with findings.
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Customer reply replied 2 years ago
Motor is an 1997 model
Model # ***** ***** or E115ELEUC
Marine Mechanic: Tan, MerCruiser Certified Technician replied 2 years ago
It is a 1997 EU
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Customer reply replied 2 years ago
Hope to try out fuel test today.
Marine Mechanic: Tan, MerCruiser Certified Technician replied 2 years ago
Ok great keep me posted.
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Customer reply replied 2 years ago
Choke didn't do anything but squeezing primer bulb did.
Sputtering died down (not completely) and rpm increased to about 5,000 rpm.
Sputtering is noticed at slow idle and again around 4,500 to 4,600 rpm.
Marine Mechanic: Tan, MerCruiser Certified Technician replied 2 years ago
Ok the primer bulb working tells us we have a fuel delivery issue. Now run the engine on an alternate fuel source. A gas can and a piece of hose connected at the primer bulb where you disconnected the boat side fuel supply. If engine runs better then we have a fuel restriction in the boat side fuel system. If no change then the fuel pump is failing. Do you follow this test?
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Tan
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,091
11,091 Satisfied Customers
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

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