Flash it !
Start your generator, plug a single speed drill into the recepticle, while the generator is running make sure the drill is in the forward posistion then turn the drill chuck couterclockwise with your hand untill your generator power's up.
This simple fix " excites " the stator.
Good luck !
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You have excessive arching on the rotor slip rings by the sound of it, if you clean them and it works well then 3 hours later same problem? What is the conditon of the brushes? Also I trust youa r enot cleaning polishing them with sanpaper etc, they have a very fine finish and should be polished with a super fine grit paper or stone, pref while turning the engine. Any scratches won't work
I am assuming after re-fueling your output power stopped working. If this is the case then remove the small cover from the end bell and inspect the brushes. They must touch the slip ring. The best way to check to see of the brushes are touching the slip ring is to use a multi-meter on a Resistance scale of R x 100 or R x 1000 and you should see a very low resistance reading. If you have a high resistance reading or an open indication on the meter; the brushes are NOT touching the slip ring. They are either too short from use or damaged due to breakage or heat caused by loose connections.
Inspect the brushes one at a time. There should be at least 3/8 inch of visible carbon brush. Anything less and it is time to change the brushes.
If you need more assistance or I completly missed the mark respond here and I wil help you.
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Pull off the small cover on the OUTSIDE of the end bell that covers the bearing and the brushes. Using a meter on resistance scale of R X 100 or R x 1000 probe the brushes and see if you read any resistance You should see a reading of much less than 1000 ohms that would be the rotor winding resistance. If you do not have resistance then remove the brushes and check the condition and LENGHT of the brushes. The brushes should be no less than 3/8" long. If you can get your test leads into the brush holes probe the slip rings and read the rotor resistance. You must read resistance under 500 Ohms. No resistance or can not reach the slip rings remove the end bell and test rotor resistance again but probing the 2 slip rings.
Most of the time the brushes wear out or break off when a generator just suddenly stops working.
Reinstall the end bell and read for a DC voltage reading of 3 - 9 volts across the brushes after you know the brushes are in good working order. No voltage then the AVR has failed. If you have voltage then the final tests would be continuity checks of the diode and capacitor in the end bell and finally the stator windings. The dilde will ony read resistance in ONE direction. It should NOT read open or shorted in both directions. The capacitor check use R x 10,000 and probe the capacitor terminals. Reverse the leads and probe it again. You should see a brief jump in resistance and the meter will drift to infinity EACH time you reverse the leads.
If you want parts information I need the model number off of the unit data plate to get that information for you.
How did you put exciting voltage to brushes? Plus to plus, minus to minus or no mater?
The condenser can be checked by a capacitance meter or an Ohm meter. Diodes also by a diode test with a multimeter. Reverse should be infinity, forward 0.5 - 0.7 V.
After working on several of this style coleman generator,i have found that the lead wires in the windings that are soldered to where your brushes would contact tend to break.I don't know if it's a poor design or just a fluke,i would check to see if your getting continuity on the rotor and go from there.They seem to either "burn off" or just break.
Make sure it is not the brush set.
There must be continuity from one slip ring to another.
If not, but rotor doesn't look burnt - check points where rotor wire is soldered to slip rings, or clear contact point on each side of wire and check continuity there, past slip rings and brushes. Big chance that wire came loose from slip ring. Had such problem on my Champiion 3500
evern if burnt - rotor is easy to rewind at home, unlike stator.
Unless your model is Inverter type - there is AVR module.
But, unless your rotor has continuity - don't bother going further.