Johnson 150 fuel issues.

[Boyd.stephen]

I’m sure this a redundant post but I cannot find a solution to my issue. I have a 2003 Johnson 150 carbureted. The motor idles for a few minutes and then slowly bogs down and runs out of fuel. I have replaced the fuel line, pick up and vro. I tried opening the fuel cap and cleaning the vent. I also tried an auxiliary tank and still no luck. If I pump the ball it will run fine. Motor runs strong when it’s getting fuel. Vro is omc premix vro! Any ideas? Thanks!

 

[Chris1956]

Your fuel pump is obviously not pumping correctly. You motor likely has a vapor separator just above the OMS pump. It' s cover must be airtight, and it's float valve must be working to properly draw fuel from the tank.

In addition, you likely have a vapor pump on that motor. It also must function properly for the motor to draw fuel.

You might rebuild both those devices. A service manual would help.

 

[Boyd.stephen]

Your fuel pump is obviously not pumping correctly. You motor likely has a vapor separator just above the OMS pump. It' s cover must be airtight, and it's float valve must be working to properly draw fuel from the tank.

In addition, you likely have a vapor pump on that motor. It also must function properly for the motor to draw fuel.

You might rebuild both those devices. A service manual would help.

Thank you! I rebuilt the old vro pump, that didn’t work, so I bought a brand new original pump and that also didn’t fix the issue. I just ordered a new vapor pump and I removed the top of the vapor seperator and found that the spring clip on the float valve is missing. I’m assuming this is the issue!

 

[Chris1956]

That is a good question. I am not sure what that spring clip does. I had thought it retained the needle valve.

I would replace the inlet needle, seat and cover gasket, with the latter being most important.