HELP-What is going on here???

Fishin with buds

Seaman Apprentice
Joined
Apr 13, 2007
Messages
31
Evinrude 175 1993 around 900 hours

just ran a bunch of mexican gas through it and ran the tank dry for the first time since i bought it about 100 trouble free hours ago.

took it out, ran fine for about 20 minutes, then hickuped and then stopped at full speed. spent 1 hour restarting it and it ran fine the rest of the day, with the exception of some heavy, intermitant misfiring.

next day, took it back out and had the same behavior.

went back, changed the fuel filter, changed the pulgs, added some ISO-HEET as i thought i might have water in the fuel. took it out again and the same thing, ran fine for about 20 mintutes, then it just quit. This time there was no restarting at sea and i noticed some white smoke coming out of the engine while i was cranking.

got it home, it started and i just ran it long enough to clean it out with fresh water, no more white smoke. pulled the plugs and they looked good, although two had black deposits around 1/4 of the rim and there was some oil present, slightly dripping if you will, out of the spark holes. compression ran 90+/-3psi all around.

The telltale recently weaked by say 5-10% just by eye, but is still hitting the pavement hard.

so i dont really know where to go from here, any advice would be appreciated.

THANKS!!!!:
 

Kevin W

Petty Officer 1st Class
Joined
Apr 18, 2006
Messages
256
Re: HELP-What is going on here???

I would check for water in the gas.

A water separating gas filter is a good investment.

Water in the gas will definately make an engine fall on its face pretty quick
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: HELP-What is going on here???

As will bad gas. You didn't get a load of ethanol by any chance? The engine will tolerate E10 (called ethanol blended fuel). But some latin American countries run and E85-like ethanol (Brazil) as well. Ethanol is an excellent fuel system cleaner that will clean up your fuel system and dump the debris in the filter and some even makes it into the carbs. Once cleaned up and carbs rebuilt the engine will live normally. E85 must NOT be used in outboards.
 
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