Onan Microlite 4000 help please.
Hello everyone.. I have a couple of questions to ask. My friend bought a new onan 4000 because he was having troubles with his old one. he is not mechanically inclined. I took the carb apart ...
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Wow am I confused. So we are working on a NEW Onan generator here? Or a used replacement? Onan has had a run of bad pumps in 2012 and 2013. Don't rule out another bad pump.
If the new carb is plugged, the same bad gas that plugged the carb likely plugged the fuel filter. This can cause the symptoms you describe because the filter will plug and the material will settle to the bottom of the filter when the fuel flow is gone. it also means that your "power the pump another way" test may only be a lucky run where the filter didn't replug.
Rig up a meter and watch voltage at the pump with the engine running, both power and ground at the same time, until it quits. Some off these units have temp and oil pressure switches that can cause a shut down.
Use a meter to diagnoise a loss of voltage, vs a physical fuel problem. If you can't get it to a state where it won't start you will have to sit there and watch it so you will know if it is one or the other.
If the new carb is plugged, the same bad gas that plugged the carb likely plugged the fuel filter. This can cause the symptoms you describe because the filter will plug and the material will settle to the bottom of the filter when the fuel flow is gone. it also means that your "power the pump another way" test may only be a lucky run where the filter didn't replug.
Rig up a meter and watch voltage at the pump with the engine running, both power and ground at the same time, until it quits. Some off these units have temp and oil pressure switches that can cause a shut down.
Use a meter to diagnoise a loss of voltage, vs a physical fuel problem. If you can't get it to a state where it won't start you will have to sit there and watch it so you will know if it is one or the other.
