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Old 06-07-2021, 03:20 AM   #1
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Default Wonít idle, wonít stay on

Hey, guys and girls, so Iím new to the boating world, so go easy on me lol. lots to learn, Iíve owned jet skis, very different. I need your help!!

So I purchased a 2008 maxum mx1800 with a mercruiser 3.0 4 cylinder last year, prior the boat sat for 3 year winterized, so I bought it because the guy wanted to sell it. On the way home I put fuel in it. Came home put the muffs on it turned water on boat fires right up. Ran great. Everything worked great did take it on the water because got it late in the season, and it need some cleaning. So then I winterized it. But I believe I put stabilizer in the tank. Antifreeze in the block. Etc.

Now this year I tired to fire it up, and I wonít stay on. Wonít idle. It has A two barrel carburetor, I gave it a couple pumps with half throttle and it fires stays on with 3/4 throttle, very rough idle. The second I put it back to neutral it dies. I also tried engaging the prop and I ran but rough and it dies. I had my brother pump the throttle so I can see the carb and before we tired to turn it on again and I only see one side on the carb is getting squirts of fuel When giving it throttle. But when we engage the prop then it get fuel to both sides. We did spark plugs And oil change prop oil is good the boat has very very low hours.

Can anyone be of some help the kids want to go riding lol. And help would be very appreciated. Thanks
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Old 06-07-2021, 11:26 AM   #2
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You have a TKS (turn key start) carburetor which has no choke but instead an enrichment circuit, these are know for getting clogged passages. Youíll need to remove the plunger to clean it. I recommend that you get the Mercruiser manual for this carburetor.
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Old 06-07-2021, 11:33 AM   #3
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Hey, do you know where I can find a manual or download one? Also when you say “plunger” that must be in the carb?
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Old 06-07-2021, 12:52 PM   #4
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Iíll look to see if I have the manual. Your pointing to it in the picture.
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Old 06-07-2021, 01:09 PM   #5
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Try this place

https://www.scribd.com/doc/88364069/Service-Manual-41
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Old 06-07-2021, 01:49 PM   #6
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Don't rule out a gas line problem (from tank to fuel pump even). I once had a 3.0 that behaved much like you describe and eventually determined that the flexible gas line insides had turned to mush apparently as a result of ethanol. Replaced the line and from that point on used regular leaded gas and never had another problem. This does seem less likely on a engine of your more recent vintage. Good luck.
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Old 06-11-2021, 09:18 PM   #7
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Default Wonít idle

Okay so the tks part came in, I installed it and itís still doing the same thing wonít stay idling, I even put seafoam in the tank gave it 2 pumps fires up then I have to give more gas to keep it from stalling the second I bring it to neutral it stalls. I ran it with a higher idle for like 2-3 mins then very quickly put it in drive then gave it more gas. Then I kept revving it so that the seafoam can work through the carburetor. But still stalls. Iíve done this a few times and then engine is getting hot so I stoped for now. Any clues
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Old 06-12-2021, 01:10 AM   #8
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Okay so the tks part came in, I installed it and itís still doing the same thing wonít stay idling, I even put seafoam in the tank gave it 2 pumps fires up then I have to give more gas to keep it from stalling the second I bring it to neutral it stalls. I ran it with a higher idle for like 2-3 mins then very quickly put it in drive then gave it more gas. Then I kept revving it so that the seafoam can work through the carburetor. But still stalls. Iíve done this a few times and then engine is getting hot so I stoped for now. Any clues
Not sure what you replaced, the enrichment plunger?

Thatís not the problem, you need to clean the passage in the carburetor body. Remove the plunger and spray carburetor cleaner into the passage. If that doesnít work the carburetor may need to be fully disassembled and soaked in a cleaner then reassembled with new gaskets.
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Old 06-12-2021, 01:25 AM   #9
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Why is the engine getting hot? Are you running it without water?
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Old 06-12-2021, 01:34 AM   #10
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Not sure what you replaced, the enrichment plunger?

Thatís not the problem, you need to clean the passage in the carburetor body. Remove the plunger and spray carburetor cleaner into the passage. If that doesnít work the carburetor may need to be fully disassembled and soaked in a cleaner then reassembled with new gaskets.
Okay I tried that, and that didnít work so Iíll disassemble it tomorrow and have it soak in thanks.
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Old 06-12-2021, 01:35 AM   #11
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Maybe because I kept the idle higher than idle, and yes water on
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Old 06-12-2021, 01:42 AM   #12
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I also took the fuel filter out to replace that was well. So tomorrow Iíll have a new fuel filter and a cleaned carburetor.

So I have another question is this the fuel filter spot.
Because I took this out. And I was still able to start the engine and rev it
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Old 06-12-2021, 11:21 AM   #13
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I also took the fuel filter out to replace that was well. So tomorrow Iíll have a new fuel filter and a cleaned carburetor.

So I have another question is this the fuel filter spot.
Because I took this out. And I was still able to start the engine and rev it
If youíre referring to the white filter on the right hand side of the picture thatís the oil filter. If you ran the engine with it off oil should have pour out of the engine.
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Old 06-12-2021, 11:40 AM   #14
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So I’m referring to the black one on the left.
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Old 06-12-2021, 06:27 PM   #15
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So Iím referring to the black one on the left.
Got ya, yes I forgot the 3.0 have a fuel filter on the bottom of the fuel pump. So you ran the engine with it removed and no fuel came out where the filter was? Maybe thereís a check valve. There will be fuel in the carb so it will run for a few minutes if not getting more fuel from 5he pump.
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Old 06-12-2021, 06:29 PM   #16
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When you disassembled the carb let it soak for several hours then use carb clean sprayed into all the passages followed by compressed air.
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Old 06-13-2021, 01:53 PM   #17
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OK guys thanks for all the help. What I did was take the carb completely apart let it sit in parts cleaner for a few hours cleaned it all up bought a new Excelerator pump new gaskets took the fuel pump out clean that out put it all back together the boat runs like a dream.
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Old 06-13-2021, 05:30 PM   #18
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OK guys thanks for all the help. What I did was take the carb completely apart let it sit in parts cleaner for a few hours cleaned it all up bought a new Excelerator pump new gaskets took the fuel pump out clean that out put it all back together the boat runs like a dream.
Excellent! Enjoy the season.
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