Onan 4000 Microlite - Need Assistance

[MNBigEasy]

I have a Onan Microlite 4000 - It runs for 10 minutes and then shuts down as if the fuel had been shut off. I have replaced the fuel filter and fuel pump which did not help.

I then ran - using a separate tubing going into a fuel container - unit started and ran for 10 minutes. I then shut it down. I didn't apply an air conditioner load.

I have removed the carburetor and cleaned it. I could not find any problem with the carbueretor.

After re-installing I connected the main fuel line and started the generator. It ran for more than 10 minutes and I then applied an air conditioner load. It immediately died.

I restarted it and again the load caused it to die.

Tomorrow I intend to connect a short fuel line to a gas container and start the unit again and apply the air conditioner load.

At this point I believe the main fuel line is the problem.

Has anyone encountered this problem and have a solution?

Thanks

Al