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Skipper
Posts: 10
Registered: ‎10-11-2015

ETEC 115...Air in Fuel System

My motor is 2007 and has always run like a top.

 

My primer bulb has always "gone flat" shortly after start and a little use.  Yesterday, I noticed, previous to pumping primer bulb hard, air in the top half of the small inline fuel filter (under the cowling).  I can only think that this is the cause of the primer bulb "going soft" after usage.  My etec has been to the dealer many times with no one mentioning the air as an issue.

 

Should I remove this air from the system?  If I do, will the primer bulb remain hard during operation?  

 

Thanks!

Admiral
Posts: 7,054
Registered: ‎07-14-2011

Re: ETEC 115...Air in Fuel System

 

 

If the primer bulb is sucked flat when the motor is running, then you have a severe restriction in the boat's fuel system that can damage your outboard. Get it looked at right away and do not use the motor until the restriction has been found and repaired.

 

The clear filter does not fill up in normall operation due to the vapor separator tank being pressurized and only allows fuel in when needed.

 

 

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.


Captain
Posts: 34
Registered: ‎09-13-2011

Re: ETEC 115...Air in Fuel System

[ Edited ]

Hi Legogmymako,

I have owned MANY Evinrudes / Johnsons (the last 2 of which are Etecs) as well as Firestone / Scott Attwater / Champion, Oliver / Chris Craft & experiences with Martin outboards. I am an Evinrude outboard fanatic, to say the least.

Since I am the first to answer, as well as a retired mechanical designer drafter, long time boater of 63 yrs. & an Evinrude guy for almost as long... my advice is this:

I am quite confident your problem is the primer bulb itself. One or more of the check valves in the bulb is broken / stuck & not allowing the full flow of fuel to your engine. The engine is trying to (and needs to) draw more fuel through the primer & is being restricted by one or both of the valves.

If not the primer bulb, you may have a restriction in the fuel system somewhere before it. The least expensive solution is to replace it. Especially, if the bulb is an AFTERMARKET bulb! They are notoriously known for failure!

WARNING:

Do not run the motor for any length of time without fixing the problem. You run the risk of operating the motor in a starving / lean condition which will eventually blow the powerhead. You may be strangling your motor to a slow but sure death. Be careful and wise. Take no chances. Get this fixed NOW to avoid a huge costly problem!!!

Best regards,
Lake Rider
Captain
Posts: 20
Registered: ‎10-22-2012

Re: ETEC 115...Air in Fuel System

When you say 'gone flat / gone soft' does the primer bulb actully suck in or is it just no longer rock hard?

When running the outboard the bulb is actually under slight suction so it will not stay rock hard. This is normal.

If it sucks in and collapses, this indicates fuel restriction upstream of the bulb & as Bluewater Bill recommends, do not run the boat until it is addressed. 

Skipper
Posts: 10
Registered: ‎10-11-2015

Re: ETEC 115...Air in Fuel System

Just to clear this up....the bulb does not go flat....it is just no longer hard.  It's been like this since day 1.  Motor runs great.

 

Fuel system not restricted.  Just saw the air in the top of the small fuel filter under the cowling and wondered if this should be

 

evacuated from the system.  Thanks.

Admiral
Posts: 7,054
Registered: ‎07-14-2011

Re: ETEC 115...Air in Fuel System


leggomymako wrote:

Just to clear this up....the bulb does not go flat....it is just no longer hard.  It's been like this since day 1.  Motor runs great.

 


 

 

OK, now we have the correct story.

 

When you squeeze the primer bulb until it is hard, you have pressurized the fuel system from the primer bulb up and  into the engine. After the motor starts up, the fuel line goes from being pressurized to having a vacuum in it due to the lift pump "sucking" up gasoline from the tank. In turn, the primer bulb is no longer hard but still holds it shape under the vacuum. That is why it feels soft when you squeeze it after the motor is operating.

 

If there is a restriction or a kinked fuel line between the gas tank pickup tube and the primer bulb, then the bulb may flatten out due to the excessive vacuum that builds up. That is when the engine does not get enough fuel for proper combustion and  damage may occur inside the motor.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.


Mate
Posts: 0
Registered: 2 weeks ago

Re: ETEC 115...Air in Fuel System

My e-tec 60 is the same, fuel filter under cowling doesnt stay full almost looks empty sometimes but motor still runs not sure if it should be like that.