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re: Outboard motor, bad gas? How to fix?
Posted on 6/30/25 at 12:40 pm to Meauxjeaux
Posted on 6/30/25 at 12:40 pm to Meauxjeaux
Got a little extra info... found paperwork on the boat. It had fuel filters and lines and plugs changed in 2022 and again in May 2024.
It sat up most of 2024 and so far this year till I ran it.
Do filters and such need to be changed yearly?
If not, I'm leaning towards bad gas / water in the tank.
Plan to drain the tank and start with fresh ethanol-free and some seafoam.
It sat up most of 2024 and so far this year till I ran it.
Do filters and such need to be changed yearly?
If not, I'm leaning towards bad gas / water in the tank.
Plan to drain the tank and start with fresh ethanol-free and some seafoam.
1
Posted on 6/30/25 at 1:55 pm to Meauxjeaux
quote:
Do filters and such need to be changed yearly?
Depends how nasty the fuel supply is. If the tanks full of shite it might need it more often than that.
Or, if the tank has a pickup screen, it could be there. No good way to know without putting a vacuum gauge on the supply and seeing what's going on.
Sticking to my original story. If you can make full power intermittently for short durations, its probably a restriction in the fuel supply somewhere.
Posted on 6/30/25 at 2:49 pm to Meauxjeaux
Most likely gumming of the fuel system but it could also be a cracked head/block due to sitting up over winter with water in the cooling jacket.
Outboards will idle fine and do so a long time with water in the oil and cylinder but they won't run at much above idle. When one does as you describe and its a water in the cylinder issue it is taking a while for it to become enough to cause the sputtering issue. It will eventually stop altogether. Good news is it will generally happen between the head and block (if it is a result of running hot) and can be fixed with JB weld...I have done it numerous times to old engines. If its beyond that the engine is toast and is in the block itself due to water in the jacket over winter. They can be replaced or you can replace the entire power head. Depending on what engine you have it may be a fairly inexpensive fix if there were a bunch of them sold.
Outboards will idle fine and do so a long time with water in the oil and cylinder but they won't run at much above idle. When one does as you describe and its a water in the cylinder issue it is taking a while for it to become enough to cause the sputtering issue. It will eventually stop altogether. Good news is it will generally happen between the head and block (if it is a result of running hot) and can be fixed with JB weld...I have done it numerous times to old engines. If its beyond that the engine is toast and is in the block itself due to water in the jacket over winter. They can be replaced or you can replace the entire power head. Depending on what engine you have it may be a fairly inexpensive fix if there were a bunch of them sold.
Posted on 6/30/25 at 2:52 pm to Meauxjeaux
Do the seafoam treatment....google it and watch some youtube videos. Once you have established it is the fuel system change the lines, filters, get or clean the tank and add sea foam to every tank of gas. Use ethanol free gas. I don't BUT I always run it dry and have never had but one 2 stroke outboard I could not repair....if you ain't a shade tree mechanic and enjoy working on them ethanol free gas will solve many issues.
Posted on 7/1/25 at 10:13 am to AwgustaDawg
Thanks, I'm a youtube mechanic but don't really enjoy it especially in this weather. Lol
Posted on 7/1/25 at 12:33 pm to Meauxjeaux
Carbed or injected? Big difference in fuel delivery. Carbed is a simple diaphragm pump. Injected can have that plus low and high pressure electric pumps. Ethanol gas rottening in the pump degassing tanks can be bad business and not that easy of a fix. Doable in the garage for sure but can be a pita and expensive.
Posted on 7/1/25 at 12:43 pm to Meauxjeaux
quote:
Thanks, I'm a youtube mechanic but don't really enjoy it especially in this weather. Lol
I know thats right. I hit the sawmill at 6 AM Friday - Sunday and by noon I am about done it....but fall is just around the corner!
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