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Jan 23rd, 2013
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120 hp Force dies shortly after reaching high speed. #12777424
06/02/18 04:01 AM
06/02/18 04:01 AM
Joined: Jun 2016
Posts: 93
Texas
H
HappyNest Offline OP
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HappyNest  Offline OP
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Joined: Jun 2016
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Texas
Need an idea on what may be wrong. The boat starts and ideas fine. On plane it will run at 50% throttle. At full throttle it runs a short time and dies. We watched the fuel filter during this process and the fuel is removed from the filter at high speed. You can pump the prime bulb and return fuel to the engine and it will continue to run at low speeds.

Cleaned The carburetors (Lower carb had stuck needle valve)
Replaced filter and hoses to carburetors
Replaced fuel lines from the tank
Replaced bulb

Re: 120 hp Force dies shortly after reaching high speed. [Re: HappyNest] #12777426
06/02/18 04:03 AM
06/02/18 04:03 AM
Joined: Jun 2016
Posts: 93
Texas
H
HappyNest Offline OP
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Texas
This is a 120hp Murcery Force 1999 model on a Nitro Sport.

Re: 120 hp Force dies shortly after reaching high speed. [Re: HappyNest] #12777433
06/02/18 04:11 AM
06/02/18 04:11 AM
Joined: Apr 2010
Posts: 267
Alvarado, Tx
T
Taylored Offline
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Taylored  Offline
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Joined: Apr 2010
Posts: 267
Alvarado, Tx
Have you checked the pick up line in the tank?

Re: 120 hp Force dies shortly after reaching high speed. [Re: HappyNest] #12777543
06/02/18 12:08 PM
06/02/18 12:08 PM
Joined: Oct 2006
Posts: 78
Azle Tx.
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DREAMIN TEAM Offline
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Azle Tx.
You may want to check the fual pump . Sounds like low capacity . If you can squeez bulb and continues to run high speed that would be an indicator

Re: 120 hp Force dies shortly after reaching high speed. [Re: HappyNest] #12777856
06/02/18 06:34 PM
06/02/18 06:34 PM
Joined: Sep 2009
Posts: 2,977
Brownsboro, Tx
D
Dawson Hefner Online content
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Dawson Hefner  Online Content
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Brownsboro, Tx
Take the cowling off and squeeze the bulb. Look and smell for leaks.


http://www.texasmegafishadventures.com
Licensed guide Dawson Hefner
Guided rod and reel fishing trips for Alligator gar on the Trinity River
903-721-4296
Hobo Outdoor Company Team Member
dawson@texasmegafishadventures.com
Re: 120 hp Force dies shortly after reaching high speed. [Re: HappyNest] #12778015
06/02/18 10:15 PM
06/02/18 10:15 PM
Joined: Jun 2016
Posts: 93
Texas
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HappyNest Offline OP
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Texas
I have not checked the pick-Up tube yet only because it is difficult to access. I did order a fuel pump kit and will install that next weekend. Iwe took the cowling off and pumped the bulb and the only place gas came from was the carburetor air intake. I had it out today and now you have too pump the build alit to pressurize the system before starting. I am starting to think I’ll need a pickup tube.

Re: 120 hp Force dies shortly after reaching high speed. [Re: HappyNest] #12778069
06/02/18 11:41 PM
06/02/18 11:41 PM
Joined: Jun 2016
Posts: 93
Texas
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HappyNest Offline OP
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Texas
Thank you all for the input You have given!!

Re: 120 hp Force dies shortly after reaching high speed. [Re: HappyNest] #12784075
06/07/18 08:22 PM
06/07/18 08:22 PM
Joined: Jun 2016
Posts: 93
Texas
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HappyNest Offline OP
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Texas
Okay so I rebuilt the fuel pump and while the rubber was about ready for replacement, it didn’t have anything apparently wrong with it. I pulled the fuel pickup and it has a small screen in it that had a ball of lint like material that had it largely restricted. No cracks in the tube so I cleaned it and returned it to service.

Re: 120 hp Force dies shortly after reaching high speed. [Re: HappyNest] #12785695
06/09/18 10:10 AM
06/09/18 10:10 AM
Joined: Sep 2009
Posts: 2,977
Brownsboro, Tx
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Dawson Hefner Online content
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Brownsboro, Tx
If fuel came out of your carb air intake while you pumped the bulb you have a needle stuck open. May not be your issue but it shouldn't let fuel by once you have pumped the bulb up and filled the bowls.


http://www.texasmegafishadventures.com
Licensed guide Dawson Hefner
Guided rod and reel fishing trips for Alligator gar on the Trinity River
903-721-4296
Hobo Outdoor Company Team Member
dawson@texasmegafishadventures.com
Re: 120 hp Force dies shortly after reaching high speed. [Re: HappyNest] #12785760
06/09/18 01:04 PM
06/09/18 01:04 PM
Joined: Jun 2016
Posts: 93
Texas
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HappyNest Offline OP
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Texas
I am glad you said that Dawson, while cleaning lower carburetor I did find a sticking needle valve. I just didn’t connect that point. Seems obvious now that you mention it. Thank you!!!

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