2005 Mercury 25 hp 4 stroke fuel problem

tide1

Recruit
Joined
Feb 6, 2010
Messages
3
Maybe someone can help with a problem I have been having with my 2005 Mercury 25 hp 4 stroke motor since I bought it. I did buy it new. It is mounted to a Tracker 175. My mercury outboard cranks very easily in hot or cold weather. It always runs great when I begin my day at the lake, however, after 2 or 3 stops at different fishing spots and I get ready to crank the motor it will crank fine but when I put the throttle in the forward position it chokes down and the motor will cut off like it has been flooded or something. I usually smell gas and when I put the throttle back in the neutral position to try and crank it again but the engine will usually not crank or stay cranked. At this point I will put the throttle in the fast idle position and the engine will crank. I will allow the engine to run for 15 or 20 seconds and then return it to the neutral position and then the forward position and it will run great again for another 2 or 3 more stops and then I will have to repeat this process over again. This is really aggravating after a long day at the lake. Has anyone else experienced this problem or have any advice.
 

rabeck5792

Petty Officer 3rd Class
Joined
Mar 2, 2008
Messages
75
Re: 2005 Mercury 25 hp 4 stroke fuel problem

sounds like heat soak.you might try priming the engine before starting.you might run some mercury fuel system cleaner thru it.the jets in the 4 stroke carbs are very small & they start to clog easily.
 

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: 2005 Mercury 25 hp 4 stroke fuel problem

by opening the throttle plates your allowing more air into the intake to manually compensate for an over rich air fuel mixture.
the fact it will start but bogs when you try to go indicates an issue with the automatic cold start enrichment or a leaking needle valve.
 

kaimalie

Seaman Apprentice
Joined
Jan 8, 2010
Messages
30
Re: 2005 Mercury 25 hp 4 stroke fuel problem

I Just Had That Problem On My 2005 30 Efi, It Was The High Pressure Fuel Pump Inside The Vst.
 

tide1

Recruit
Joined
Feb 6, 2010
Messages
3
Re: 2005 Mercury 25 hp 4 stroke fuel problem

Thanks for the replies. Some valuable information. I will respond later with the results.
 
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