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1986 318 onan B43G
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Discussion Starter · #1 ·
Hi everyone I am new here. I have a question about my new to me 318.
the other day I was blowing wet snow we got in mn.
It was running perfect. I ran out of gas 1/2 way through put non ox in with a little sea foam. It started back up. Now it won’t it won’t high idel at all. Sounds like it’s labored. Turn blower on and it goes down to a low idle then dies. Without blower on it barely moves. The points are done carb cleaned new fuel pump. Also the spark plugs are new and the pick up and filter is good.
Any help would be great.

thank you for your time
Tom
 

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Welcome to the forum. Lots of things could have happened when you ran out of gas. Any of the fuel lines could have gotten plugged or depending on the type of fuel filter, debris could have flowed into the carburetor it could still be plugged even though you cleaned it.

Is there a fuel filter in the fuel line? Some filters are nothing more than a screen that can let lots of garbage through and some filters are paper filters with very small openings. Always use the best fuel filter you can.

Why did you change the fuel pump and what type is it, vacuum operated or electric? Did you test fuel flow after you changed the pump?

When you cleaned the carb, did you remove the bolt on the lower left side (looking from rear of tractor) and remove the high idle jet located in the bottom of the fuel bowl?

How about when you removed the top of the carb, did you make sure all the holes in the long pickup tube attached to the top of the carb are clean?
 

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1986 318 onan B43G
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21 Posts
Discussion Starter · #3 ·
Thank you for your response.
the previous owner did the carb before giving it to me. He has had this tractor since new. He also works for RDO so I know he did it right. Plus it ran perfect when he gave it to me.The fuel pump is a pulse type pump. It was suggested that I try that because of running out of gas plus age. I didn’t check the flow thinking about it now I should have.
I dropped it off at a shop by place and he does small engines and even he stumped. I thought I would
Ask everyone here and maybe give him some ideas. I have never had a tractor like so I am lost.
 

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It's possible the once clean carb could have gotten plugged by debris from the bottom of a fuel tank when you ran out of fuel or maybe there is water in the carb now if there was water in the tank.

How much fuel is in the tank now?

Did you try the fuel valve on the left side of tractor? There are two pickup lines in the fuel tank, Main and Reserve. Maybe one line is plugged or maybe one of the pickup tubes fell off in the tank and now it is hard for the fuel pump to pull fuel from the tank. One line is a reserve line and it is set deeper in the tank in case you run out of fuel using the main fuel pickup line.

The vacuum line from the engine to the fuel pump sometimes gets brittle and leaks or does not make a tight seal on the fuel pump How did it look when you replaced the pump? If it is bad, the fuel pump will be weak.

Check for good fuel flow coming out of the pump and we can go from there.

Was the fuel filter changed after you ran out of gas? Maybe everything is OK but the filter is plugged.
 

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1986 318 onan B43G
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Discussion Starter · #5 ·
The tank now is 1/2. The fuel pump was a little dirty I thought. I change the filter when I changed the fuel pump just for insurance. I am going to guess that maybe water got sucked up into the carb. I will pull apart and clean it. I am also planning on putting a bottle of heat in with the gas for insurance once it’s running smooth.
 
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