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Old 06-22-2015, 04:27 PM   #1
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Default No Low Idle Running

Ok guys, relatively new to boating, only have had outboards before. I bought a 2008 Maxum 1800 MX. I have gotten it out this year, it starts but then shuts off relatively quick unless i can give it some gas, then it will run. If i try to just put around it dies, this makes docking pretty tough, have to come in hot. I am very mechanically inclined (with cars) and am coming to the conclusion that this could be due to bad gas. the guy i bought the boat off of said that the guy who winterized it for him may have done a shotty job. Under high accelleration the boat runs good. at low idle it stalls out and has a hard time restarting. Looked at the plugs they look good. The boat did have about 2/3 of a tank when i got it from the previous owner, i have topped it off with premium gas and a bottle of octane booster. after reading some threads in here, im thinking i might have to drain the gas tank and start fresh. I also did not see any water/fuel separator nor an external fuel filter, are they located in tank? Any and ALL advice is much appreciated.
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Old 06-22-2015, 04:39 PM   #2
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welcome aboard.

what engine do you have?

Does it have an electric fuel pump? If yes may be a week oil pressure switch that provides power to the pump. Higher rpm providing enough Op to keep the switch closed.

Carb or fuel injection? If carb Choke or TKS?
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Old 06-22-2015, 04:39 PM   #3
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sorry should have said that, 3.0 Merc 4cyl. Looks like a mechanical fuel pump, Carburated.
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Old 06-22-2015, 04:44 PM   #4
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Thanks. Merc offered a carb they called TKS (turn key start) It eliminated the choke and incorporated an enrichment circuit by means of a solenoid and a temp sensor, these are know to go bad and will cause your issue.
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Old 06-22-2015, 04:57 PM   #5
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what is the best way to know if that is what i have? and how much are they to fix? is it just a solenoid?
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Old 06-22-2015, 05:05 PM   #6
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On top of the flame arrestor it will say TKS or remove the flame arrestor and see if there is a choke or not.

Go to this site and find the manual for the carb

Boatinfo - Mercruiser Service Manual nr. 16 - 1993-1997 - Engines GM V8 454 & 502 CID (Gen V - Gen VI)

Manual # 41
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Old 06-22-2015, 05:08 PM   #7
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wow that is a wealth of information! thank you. Should i rule out bad gas and go with this? i just dont want to drain out 20+ gallons of gas if i dont have to.
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Old 06-22-2015, 05:12 PM   #8
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There should be a gas/water separator near the fuel pump. Remove it and pour the contents into a glass jar to look for water or phase separation (two separate color liquids) that can occur with E10 gas.

if this checks out then I would suspect the carb.

Note I have horror stories with this carb but have never worked on one myself.
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Old 06-22-2015, 07:06 PM   #9
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If it does have a choke plate make sure it's fully opened when warmed up. I have to adjust mine twice last year to get it just right. Made a world of different in starting and idling.
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Old 06-22-2015, 07:20 PM   #10
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thanks a lot, if the tornados stay away im gonna look at it when i get off of work today and ill update tomorrow what i find.
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