Question about Champion 3500/4000 Watt Portable Generator

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Generator gallops and then shuts down. Carb and fuel are like new.

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2 Answers

My onan 4.0 generator will not idle and is back fireing while trying to run it will run fine for ten min then starts trying to die and starts back fireing when I try to keep it running


check for a faulty sump oil switch . check for faulty coil ( magneto on the flywheel) as the time it runs suggests that it is breaking down internally.

Feb 11, 2015 | Onan CUMMINS 4.0 KYFA/6747 - Cummins...

1 Answer

Generator wont turn over.


Try this remove the plug, then try to pull start it, is the resistance the some? If it is check the oil for a gas smell replace it. If not make sure the plug is dry and replace it. If it starts and runs get some gas dry and put in the tank (not all of it a 1/3 will do fine) restart it and see if it helps. I am thinking that ice maybe forming in the line (ice will from when it is above freezing too) causing to much gas in the carb. flooding it "to gallop"and then washing the oil off the cly wall making it hard to turn over

Mar 07, 2014 | Electrical Supplies

1 Answer

Coleman sport 1850...when turned on .fuel runs into and right out of the carb until line closed. generator not used for two months but fuel was tunred off and unit allowed to run until it ran out of fuel. ...


When you drained the carb chamber by working with closed line, the floater in the carb chamber has fallen down. After two months later you let the fuel in again, the floater remain in down position and could not shut the input needle valve.

You may try to knock sharply (but not very hard) the carb cover when full, before opening carb cover in order to check the floater and valve. 

Aug 04, 2010 | Coleman Sport 1850 Generator

2 Answers

Will not start gas not getting to it


This might sound dumb ... is the fuel valve turned on?

May 26, 2010 | Watts Onan Portable Generator - 4000 ,...

2 Answers

Our onan generator ran out of gas. we refueled but the generator will not start. i gave it a shoot of starting fluid, the generator fired and run for a second, then died. could it be a cogged fuel filter?...


No, not the filter, you will need to try to prime the carb better then with starting fluid, pour some gasoline down the carb, you may have to do this a few times, but everything will fire back up again once you get the air out of the system

May 25, 2010 | Watts Onan Portable Generator - 4000 ,...

2 Answers

Onan 4000 start good runs only ten minutsand shuts down,starts up


First locate the oil pressure switch and see if you can bypass it,then see if it runs. If not check the fuel filter and fuel pump,make sure solonoid for fuel pump is kicking on.

Jun 07, 2009 | Watts Onan Portable Generator - 4000 ,...

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