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Hello Martin, Your generator might have a low oil pressure shutdown switch. First check the oil level. If oil level is low, fill oil to proper level. If oil level is fine, I would install an auxiliary oil pressure gauge . If oil pressure is normal, I would change the oil sender unit. If oil pressure is low, I would change the oil pump.
Check the pickup tube in the vehicle, the fuel pump is suspect. If you check the fuel pump pressure and it is ok, then try installing a test check valve between the fuel delivery hose to the generator. If it solves the problem the pump is losing it's prime internally, so replace the fuel pump.
If it stops after 5 minutes whether under load or not, and assuming the air filter, plugs, and fuel filter are new and or clean. The fuel pump is suspect. If it is in a motorhome try conencting it to an external fuel source that is at the same height as the generator. Then higher than the generator. If the problem persisits replace the fuel pump. Or just check fuel pump pressure with a gauge. BE CAREFUL do not use an automotive fuel pump Onan have special low pressure pumps, so use OEM part