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86 johnson outboard won't stay runn after ran out of fuel


Cinvanheiden

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So we went fishing the other night and on the way back in we ran out of fuel. Refueled today and primed using the bulb like always. After it ran a couple of minutes it died. Primed again and ran a few minutes and died again. I figured it had air in the line, so we just kept priming and starting. It stayed running for a lot 5 minutes ago we left the dock only for it to die again. Then again. As long as we kept squeezing the bulb, it would run. However, being new to all this, I don't know what is happening. On the fuel tank, there is a knob (I guess that is what you call it) that is like a vacuum. Is it supposed to be open to allow air in or tight to create a vacuum. Not sure if this might be why it wouldn't stay running or not. Other than that, what could be my problem. It ran great before running out of gas. 

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Anyone else? Please respond. I don't want to have to put it in the shop if I don't have to. What would make it not stay running when it was running fine before it ran out of gas. 

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1 hour ago, Cinvanheiden said:

Anyone else? Please respond. I don't want to have to put it in the shop if I don't have to. What would make it not stay running when it was running fine before it ran out of gas. 

Yes, if the screw vent is closed the outboard will not pull fuel from the tank 

source: raised on a 17 foot Glaston trihull with 85 hp evinrude and three six gallon portable tanks

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Ok. So the vent screw is open. Still won't stay running. Prime it with the bulb, starts right up. Runs a couple of minutes and dies. 

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You didn't say what HP engine you have.  I'll assume it is a small one since it won't stay running (a larger one will just bog down).  Remove the front plastic cover from the carburetor, rev the engine way up, then put your hand fully over the carb opening.  This will suck the gunk through the jets and you should be good.  You may need to do it several times to clear it out.

If this doesn't help, consider changing the o-rings at both ends of the fuel line since it could be sucking air.

If this doesn't help, consider rebuilding the fuel pump with a kit since I'm sure you have never changed it and the diaphragm is getting pretty hard.

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