Onan Generator stopped working in motorhome because the gas got too low. I blew out the front fuel filter,changed oil and filter, air filter, one spark plug and now it won't start. Is there a fuel shut off valve that automatically stays shut when the gas from the motorhome fuel tank gets below 1/8 tank? No fuel is getting to the front fuel filter of the Onan Genset 400 BHE now and it will not start. Could it be a shut off valve or the fuel filter?

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is it getting spark is it getting fuel kill switch doesnt let turn over --on off switch lets it turn over ----check for spark ---if spark check fuel --fuel filter - air filter etc --last time tune done --carb may need cleaning --rebuild or replacement etc

check oil level in the sump
if the oil level is correct check for a problem oil level sensor circuit
it is there to stop the engine when the oil level reaches critical level

Is this gasoline or propane fueled?

Try bleeding the generator as some air could have entered in the system.

Our motorhome Onan 5000 Marquis generator will turn over and try to start but fails everytime we test. We have primed, gas and oil are fine and we have new spark plugs. We also changed the gas filter on the generator. Any suggestion? Thanks, Loretta

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

ok simple things first, new spark plug, fresh gas, a decent dose of fuel cleaner a bottle doses 12 gallons so say if 3 gallons gas use 1/4 bottle (yes double dose wont hurt) , air filter, try running this first and see if it picks up over time, the methanol gas really crude's up small engines and the cleaner will hopefully clear it up, use fuel stabilizer with ethanol protection and dont let tank sit empty always full to keep moisture to lowest level. if this doesnt work then likely carb is fouled and needs rebuild

If the fuel filter (strainer) is OK, carb gives enough fuel for the load you apply, air filter is dry and clean, your problem may be the low oil level protection.
Check if generator is at level position.
After the oil is distributed in all the engine its level may go less than the measuring sensor level. Try to put some more (not much) oil. 
If this will not help your measuring sensor may be bad and switch off when the oil gets hot.

Make sure the fuel valve is on