Mercury 110 red stripe

Hey guys, I have this older model mercury 110 which is I believe like a 9.8 hp. It has a small red stripe on the cowling in the middle. On the carburetor where the float spring meets the needle that goes up and down, there is a small hole made into the housing. Whenever I prime the bulb I will get fuel squirting out of that small hole in the housing. The motor will run as long as you’re spraying starting fluid into the carburetor, but other than that it will not run. I put a rebuild kitInto this carburetor, and it still won’t run. I am at a loss of what to do now?


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Clean the needle and seat and Adjust the float. Check the float for pinholes and gas inside it. This can happen with age. Also make sure the float is adjusted properly.

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Originally Posted by Barnacle Bill

Clean the needle and seat and Adjust the float. Check the float for pinholes and gas inside it. This can happen with age. Also make sure the float is adjusted properly.

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I put a new needle and gaskets in it. The needle seems to come down too far, causing it to not go up straight when trying to re-install it.


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I got it where it will run for about 30 seconds, then it just sputters a couple times and it quits. It acts like it runs out of gas. How do you know if the fuel pump is pumping?


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Originally Posted by Nutbush

I got it where it will run for about 30 seconds, then it just sputters a couple times and it quits. It acts like it runs out of gas. How do you know if the fuel pump is pumping?


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Take the output line loose and try to start it. Gas should come out in squirts not steady. But the best way is to put a pressure gauge on it using 2 pieces of hose and a T fitting. Does the new needle look like the old one? Needle should move up and down smoothly. And did it use to run?

I forgot to ask, do you have a manual for that motor?

No I don’t have a manual for it. It ran about 5 years ago, but has just been sitting up since then. I’m going to check the fuel pump and see how it does


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Attachment 457840Attachment 457840


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I believe this is my culprit. I can turn the motor over, but I get no fuel out of the outgoing line. Is there a way to take it apart and fix it, or will I need to replace it? I have looked up the part but can’t find it. Any help with a new part is appreciated.


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Check with a mower shop. Take the pump in with you. I believe that is the same pump I just bought to go on a Honda motor on a tiller. I bought an Oregon brand pump for about $20. I can't say 100% for sure the pumps are the same but they sure do look exactly the same. I will post a picture of the pump I bought with a part number in a few minutes.

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This is the fuel pump I was talking about with the bag it came in with the part number. I hope this is the same as yours as they are inexpensive! The one it was ment to replace does not has the extra screws in it, it looks just like the one you posted the picture of, this is just a generic replacement pump so they do look at little different but function exactly the same. Hope this helps!Attachment 457842

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Quote:

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Originally Posted by sweathermon

This is the fuel pump I was talking about with the bag it came in with the part number. I hope this is the same as yours as they are inexpensive! The one it was ment to replace does not has the extra screws in it, it looks just like the one you posted the picture of, this is just a generic replacement pump so they do look at little different but function exactly the same. Hope this helps!Attachment 457842

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It looks like it’s built similar. I will check Monday, thanks!


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Update on my motor. I bought a new vacuum fuel pump like shown above. I installed it yesterday, and pulled the cord, and it still would not pump out gas from the new pump. So, what I have figured out so far is, it will crank, and runs really well while running, but goes dead after about 50 seconds. You can tell that it is running pout of fuel because it has stray sputter a few seconds before dieing.


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Did you check the inside of your fuel line for flaking and breaking down how is your fuel bulb? Pumping the fuel bulb should keep it running unless the carb is totally not set up right or junk in the jets. Sitting 5 years has to be a bunch of build up in the fuel system.

I would double check and make sure that you don't have the impulse/feed lines turned around or something.