2005 Mercury 50 bogs with quick push to wide open throttle

Joseph10

Petty Officer 3rd Class
Joined
Feb 28, 2009
Messages
76
All,
I was hoping someone could help me determine my problem. I have a low-hour 2005 Mercury 50 3 cylinder 2 stroke on my Bass Tracker.

It runs great, except when I quickly go from idle to wide open. If I ease it to wide open, no problems. I see no issue with performance except for this problem.

A friend of mine at work suggested replacing the diaphram in the fuel pump that is located on the side of the engine.

When I was poking around on it this weekend, I also noticed a white fuel filter between the fuel pump box and the carburators. I thought that might be a culprit as well.

I pulled all the plugs and they all look great - no fouling.

I guess it could also be the carburators being clogged. However, I would think that would affect it at wide-open at all times. I also noticed that the primer ball is staying hard, which is something to check off the list.

The boat does sit up quite a bit (could have been 4-5 months over the winter), since I have to work so much, but I do use Stabil at all times. I do try to run it with muffs for 20 min or so every 2 months if I am not able to get to the lake.

Any help or suggestions would be greatly appreciated.

Thanks,
Joseph
 

Joseph10

Petty Officer 3rd Class
Joined
Feb 28, 2009
Messages
76
Re: 2005 Mercury 50 bogs with quick push to wide open throttle

bump
 

Joseph10

Petty Officer 3rd Class
Joined
Feb 28, 2009
Messages
76
Re: 2005 Mercury 50 bogs with quick push to wide open throttle

All, any comments would be greatly appreciated. :)
 

Jeff Lindquist

Seaman Apprentice
Joined
May 19, 2011
Messages
41
Re: 2005 Mercury 50 bogs with quick push to wide open throttle

same issues with my 4 cyl 1982 80 hp mariner. new diaphragm and rebuilt fuel line from tank. new ball, new fittings, etc. tank test went well last night but still have to lake test. i owuld think you are drawing air somewhere after the ball then. (diaphragm, fuel line from motor shroud quickconnect to fuel inlet on fuel pump, fuel pump to carbs) However, i have already done my carbs so don't eliminate that as a suspect. kits are cheap, and float drop level is very specific. mine is 11/16" exactly, no more. is there a strong fuel smell?
 
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