Oil is being pulled from valve cover to air filter on my onan microquiet 4000 generator, what do I need to do?

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Air Filter:

Air Filter 140 3280 Made For ONAN Fits 3600 4000 MicroQuiet Generators

check the current draw from the machine
being a 4000 watt machine if you are drawing 4000 watts it is overloaded as that is the surge power available not constant power which is around 3500 watts
that would account for the requirement of fans to keep it cool
even if It is not 4000 watt what ever capacity it is it is running in an overload situation

check for bad battery, loose terminals ,dirty terminals , faulty starter relay
if it is not starting check for oil level is correct ( low oil level sensor turns off ), diesel -air in system

Check the ignition circuit, and trigger coil for correct resistance on the trigger coil, and the ignition coil. The trigger coil is a small module on the engine shaft near the flywheel.

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.

contact www.advanced-power-technologies.com they will help you

bendix is actual the spring that pushes the gear back out of the ring gears engagement your issue is more likely a rusted /corrodied incline engagemnt gear a little lube will probably bring ti right back (do not us WD_40) this is not a lubricant it is an anti lubricant any light oil will do Good Luck

Remove the air cleaner and inside near the throat of the carb is two bolts holding the carb to the intake remove these. Unhook the fuel line and twist the carb to allow the linkages to remove.

Take and locate the oil pressure switch and try bypassing it,if that aint it check fuel filter and pump.