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Sully2's avatar
Sully2
Explorer
Aug 14, 2013

Genset crazies!!..??

Genset has been hard if not impossible...to start lately...so I figure it was time for total maintainence.

Changed fluids and filters etc.

Starts now BUT...when running it seems at times to stumble and sort of falter??? When running it may run smooth as silk for 1 minute...or 10 minutes but then again..up pops that stumble / falter.

Any good ideas of what to start looking at?

(8KW Power Tech with Kubota engine)
  • Problem fixed. After LONG and HARD examinations I determined it was caused by a set of LOW BATTERIES!! ( dont ask me how low batteries can cause a genset to surge because Im no electrical wizard at all) but I got fed up with it all...pulled those 4 batteries that were about 4 months old...took them back....got 4 brand spanking new ones...and when installed I did a preheat and a START....and it fired up and ran smooth as silk!
  • codytyler wrote:
    Sully2, I haven't been on in years now, so it's good to see old names out there. I had similar problem a couple or years back and after trying everything I could think of, I took it to Cummins, who then informed me (and fixed it)that my fuel line to the genset, had actually been pinched off by the slight movement of my fuel tank. Had to drop the tank, and fix the line and reroute it. Good Luck.


    No need to stay away partner...we always have something for most all people.
  • Great! Glad you got it fixed. Wonder why the batteries were low?
  • lfeather wrote:
    Great! Glad you got it fixed. Wonder why the batteries were low?


    Beats me..???
  • I have that same generator, and mine would do the same, stop and go, change fuel filter, change fuel pump, found out 2 thing wrong, first was the fuel line were wrong, switch line and now have lot of fuel to the pump, but no fuel out of pump to engine, check the pump and no electric power to the pump, took pump off and benched tested it and it run fine, even the old pump run fine on the bench, so jumper the pump from the battery and the gen run just fine, called power tech in Florida and Jeff said the relay has gone bad, he said change out relay or put the gray wire to the hour meter, or wire it direct to the battery with a switch, did the last thing and have had no trouble now. The only thing is now I turn on the pump first so fuel is going to the engine then start the Generator, don't forget to turn off switch when you turn off the Generator.
  • Super Guy 78 wrote:
    I have that same generator, and mine would do the same, stop and go, change fuel filter, change fuel pump, found out 2 thing wrong, first was the fuel line were wrong, switch line and now have lot of fuel to the pump, but no fuel out of pump to engine, check the pump and no electric power to the pump, took pump off and benched tested it and it run fine, even the old pump run fine on the bench, so jumper the pump from the battery and the gen run just fine, called power tech in Florida and Jeff said the relay has gone bad, he said change out relay or put the gray wire to the hour meter, or wire it direct to the battery with a switch, did the last thing and have had no trouble now. The only thing is now I turn on the pump first so fuel is going to the engine then start the Generator, don't forget to turn off switch when you turn off the Generator.


    It would be easy enough to put a "buzzer" on that circuit. When getset it in...no buzzer...genset OFF...buzzer kicks in.

    Whats causing the battery drain beats me...??? For now...( short time fix) I'll just turn the battery breaker OFF...but thats a workaround...not a fix.