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I have a 1981 Mercury Black Max - v6 Carb 200 HP. I have…

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I have a 1981...

I have a 1981 Mercury Black Max - v6 Carb 200 HP. I have fuel that spits out of the hose that is connected to the bottle of the airbox. I am trying to figure out wh

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.

How to correct this.

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The engine starts right up and runs well.

Submitted: 6 months ago.Category: Boat
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Answered in 8 hours by:
12/8/2017
Marine Mechanic: Jason, Marine Mechanic replied 6 months ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 17,412
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
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G​ood morning, my name is ***** ***** am I speaking with? I read what you wrote. Mercury engines are cataloged by serial number. Can I get that number so I can look up and see exactly what version of the 200 you have.

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Customer reply replied 6 months ago
Hi Jason,My name is***** model number is(###) ###-#### I think that maybe the bleed line might not be routed correctly but I am not too sure. I have not been able to find the diagram for my engine. I have a video of what it is doing that I am going to try to upload now. Please let me.know if you receive it. Thanks for your help!
Marine Mechanic: Jason, Marine Mechanic replied 6 months ago

H​I Matt. What you can do on the video is upload that to YouTube, and then simply copy the link and paste it over to here. Give me a few while I try and look up this serial number.

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Customer reply replied 6 months ago
Ok, I'm going to do that now. Thanks
Marine Mechanic: Jason, Marine Mechanic replied 6 months ago

I tried running the serial number and it's not coming up as valid. Did that number come off of a sticker on the outboards clamp bracket or did it come from someplace else?

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Customer reply replied 6 months ago
it came off of the plate on the back of the motor.
Customer reply replied 6 months ago
https://youtu.be/N3cjqdO9SSk
Marine Mechanic: Jason, Marine Mechanic replied 6 months ago

O​kay I see the video. That is part of the engines bleed/recirculation system. It is not a problem, that fuel will actually get sucked back into the carbs and get re-burned. Do you have the cover for the carburetors? This is a cover that goes over all the carbs.

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Customer reply replied 6 months ago
I have a cover. But it leaks out from the bottom (slowly) when the cover is on. I tried sealing it with a sealant that can withstand fuel and it eventually starts leaking again.
Marine Mechanic: Jason, Marine Mechanic replied 6 months ago

When the cover is in place, there would be vacuum building up inside of that cover. (The carbs are "sucking" aire in, so it would suck that little bit of fuel in with it to) This vacuum sucks that leakage out and draws it back into the engine to be re-burned. Does this engine have good compression?

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Customer reply replied 6 months ago
it has between 120 and 118 on all cylinders.
Marine Mechanic: Jason, Marine Mechanic replied 6 months ago

Are you near the motor now to hold your hand over each carb and see if you can feel strong suction from each carb or see if you feel any pressure or spitting back at you from any carb?

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Customer reply replied 6 months ago
Not this second but I can try in a little while. I will give it a shot and will let you know. Thanks.
Marine Mechanic: Jason, Marine Mechanic replied 6 months ago

Okay let me know what happens. Also send me a picture or two of the cover so I can see if it's damaged or not.

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Customer reply replied 6 months ago
Will do! Thanks!
Marine Mechanic: Jason, Marine Mechanic replied 6 months ago

Y​ou are very welcome.

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Marine Mechanic: Jason, Marine Mechanic replied 6 months ago

Hello, just checking in. How did you make out?

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Customer reply replied 6 months ago
HI Jason,I finally was able to put my hand over the carbs and there seems to be decent suction. There is no spitting back from any of them. It still drips though.
Marine Mechanic: Jason, Marine Mechanic replied 6 months ago

G​ot it. The next thing you want to check is the fuel pump. You would want to pull that apart next and see if there is a torn diaphragm in it.

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Customer reply replied 6 months ago
Good Morning! I did that and everything is in good condition. The fuel pump was rebuilt about 3 or 4 months ago.
Marine Mechanic: Jason, Marine Mechanic replied 6 months ago

Have the carbs been rebuilt yet as well? A flooding carb would also cause excess fuel in the crankcase.

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