Question about Watts Onan Portable Generator - 4000 , Model# 5500

2 Answers

Will not start gas not getting to it

Generator will not start acted like it is not getting gas

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  • rev43320 May 26, 2010

    No that is not it gets the gas straight from the regular fuel tank. The tank must have at least 1/4 tank to run the Gen. setting on half tank now.
    Took the line loose just before the Gen. no fuel there, can't find out if it has it's own fuel pump, if it does there should be a fuse to it but can't find one for it.



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Be sure to ensure the fuel pump is pumping fuel to the carb by pulling the hose off the carb and watching for adequate flow. A faulty electric fuel pump can often only show symptoms or act up after it is warmed up. Sometimes it may run for 10 or 20 minutes and just shut down. Check for fuel flow immediately upon stalling if this is your symptom. Mine would shut down after 20 minutes and not restart for awhile. I pulled the hose off the carb immediately and noted there was no fuel in the line and it would not pump fuel while holding the start switch on either. If you are mechanically savvy you can disconnect the hot wire the positive wire (red) leading into the fuel pump and connect it with 12 V and see if it pumps fuel out the hose also, but be careful to capture the fuel coming out the hose). Once cooled down it pumped fuel in a weaker than normal stream, but when hot after 10 or 20 minutes it quit pumping causing stalling of the generator. Replaced the fuel pump (and new filter while at it) and everything worked fine again on my 1995 Onan. Much stronger fuel stream noted too from the hose.

Posted on Aug 25, 2017

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

Posted on May 26, 2010

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  • A Miller May 26, 2010

    I think the tank is above the engine, it may not require a pump.

    Im not sure on this model.

    Study the fuel line path ... it comes out of the tank ... should go through a valve ... you say it is on ... check it. From the falve it goes to the carb or a pump. Pull the line off ... got gas? Yes ... put it back ... No ... make sure the valve is on ... blow back through the line ... air going into the tank? It may have been blocked.

  • A Miller May 26, 2010

    Oh? ... my efforts not helpful ... thanks ...

  • A Miller May 29, 2010

    You disconnected the fuel line from the engine and there is no fuel coming out of the line, directly from the tank ... and you are still looking for the pump ... most lines come from the bottom of the tank ... does your?

    good luch with your project.



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