My last test run of this motor lead me to believe I had fuel pump issues…so in this video I replace the fuel pump gaskets and diaphragm. Check my site 2day…
Fuel Pump Diaphragm replacement Mercury outboard 110
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The plastic diaphragm for ethanol blended gasoline makes sense to me too. I had an email exchange with the technical info guy for the company I’ve been ordering outboard parts from and he didn’t know what the deal was with the duplicate parts made of different material either. We have one gas station here that has a banner by the street that says their gas “contains no ethanol” so that’s where I’ve been buying my outboard fuel. I’d like to think that’s the case anyway.
Yes thank you, I got it, i taped in a fallers wedge in and it poped out for me.
Thanks again.
By the way, I think I’d avoid using the gasket-maker goo… unless there’s something terribly misaligned the gaskets should be sufficient. If it isn’t pumping fuel, but you’re sure the carb and fuel pump is assembled correctly then it’s possible the crank case port between the engine and the carb is blocked, or else the seal on top of the motor (under the flywheel) is leaking which in turn prevents the development of pressure required to operate the fuel pump.
One guy says the plastic one is for fuel with ethanol…makes sense to me. I think If I were to do it again I’d go with the plastic one. I can’t find fuel that doesn’t contain ethanol anymore.
Mine didn’t come apart very easily either. I had to give a couple of solid whacks with a rubber mallet to “encourage” it to come apart. those two bolts are all that hold it together. You must be in the process of replacing the water pump impeller…
I’m rebuilding a carburetor / fuel pump for the same outboard wondered if you ever found out why there are two diaphragms that are alike in the kit. The one that came out of your fuel pump when you disassembled it looked like the non-rubber-ized type. I looked for info on the web page you mentioned but didn’t see anything related to the after-rebuild situation.
Mine had the rubber-ized in it so that’s the one I put back in it. I too am wondering which one – or both – should be used.
Have you had the leg off? I have the same motor and have undone the 2 bolts but the leg wont drop down? Thanks for any help anyone can give me.
The plastic one is for ethanol fuel.
Hi
I tried for days to start the motor up, it would not. Then the next day it started right up – The carbs were fine and the next few starts were good. We moved around the lake 2 times and the motor starts right up, Then when we want to get off the lake and the motor does not want to start up. Someone said it could be the carb diaphragm. It had not been changed in 15 years, since new. Any
thoughts?
I took the hose off of the gas can and put it in through the opening for the cap to make sure it wasn’t that and to verify the internal hose and filter in the gas can wasn’t clogged. It still did it. the only hose I haven’t checked is the small hose that connects the carb to the gas inlet on the engine.
Is there a clogged vent on your gas tank? Maybe the cap?
I never did get it figured out. My last ditch efforts I was going to try was swap the short fuel line between the carb and fuel fitting (only hose not swapped) and if that failed I was going to glob some gasket maker around the seams on the carb then fire it up while it is still wet…
It has to be sucking air somewhere…that has to be what is wrong, just finding the leak has been quite the challenge. Where I fish I can’t even have a gas engine on my boat so I have put it on the back burner.
Hi I have a similar problem with my motor. It runs fine at about half speed but once I go over that it will run for a short time then begins to bog down and I have to pump the primer bulb to keep it running. We have changed gaskets, rebuilt carb, new impeller, new fuel lines and connecters and nothing seems to be working. Have you figured out this mystery???
Havent’ changed the filter…where is it? I checked the tank connection by just removing the hose and submerging it in the gas/oil mix. Primmer bulb and lines seem ok, I am going to replace the short 3″ piece of fuel line that goes from the fuel inlet connector to the carb, and I have a few other things to try also. I have family visiting so I may not get to it till this weekend at the earliest…maybe later.
Thats what I would have done… I will be doing the diaphragm replacement soon myself. . I assume you changed your filter, checked your tank connection, primer, lines and all. That gasket is probably an extra, you bought the kit so they sometimes come with extra parts. Let me know when you get it figured out whta it took.
…so I took it out this morning and it is doing the exact same thing. I can run it as long as I want to at any speed as long as I keep the primer bulb manually pumped up. Idling along at about 4-5 knots I have to squeeze the bulb every ten seconds or so and full speed I have to squeeze the bulb about every second. Any ideas….?