What is the purpose on an electric carb float on 10,000 w Honda generator engine?

After reading about Honda's Eco Throttle system available on inverter generators it seems it is not a fuel metering system but a computer controlled speed regulator or basically an electronic throttle.
Because the engine of an inverter generator doesn't need to run at a constant high speed to produce the correct 50 or 60 Hz output this generator can run at slower speeds when the load is light. The electronic throttle is the means to make it happen - operated by the computer.

The throttle is probably operated by a stepper motor and the power supplied to it likely to be in digital form. I suggest you try and gain a more full account of how the system works before you delve deeper.

Float probably stuck. Remove and rebuild the carb.

Rebuild carbs ! Trash in needle float not closing !

Always run it out. Gas gums up when left in too long. It will plug the jets inside the carb . Then it's off with the carb to disassemble it and clean the jet ans float valve.

if it is the float bowl drain leaking, close the drain. If it is the vent, clean float bowl and needle and check level. Next time, drain the fuel out of float bowl after you run it if not planning to run it for 30+ days. That is why they put drains on generator carbs. Modern ethanol turns to gum real quick. Tell you congressman you think ethanol sucks and the new 15% ethanol the farm lobby is trying foist off on us is going to be a disaster for small engine owners.

It appears you have eliminated all of the fuel related issues. That would leave the generatoor safety circuits as a possible reason for the unit shutting down.

The Low Oil Level Sensor is the major reason that generators shut down when your sure there is not a fuel supply problem. Make sure the unit is fully servied with OIL. If the problem persists disconnect ONE wire from the low oil level sensor and see if the problem persists. If you still have the problem inspect the black or green wire from the Start run switch all the way to the Air shroud on the engine looking for signs of chaffing.
If you can not find anything then you will have to re-focus your attention on the fuel system once again. If you have a solenoid on the base of the carb.. the solenoid can be WEAK and stop remaining open once hot. This will cause the engine to lean out and die.
You should also check fuel flow to the carb. The flow should fill a spary paint can lid in under 10 seconds to the point your worried about it overflowing. Most honda engines have a metal sediment bowl under the fuel selector. Remove the sediment bowl and dump the contents. Check fuel flow again.
- Carb. With the float bowl removed fuel selector ON check fuel flow again by holding a spray paint can lid under the float. It must fill up in about 10 seconds to the point your worried about over-filling the lid. If you do not have a good flow rate here the float needle float needle rubber seat and the fuel manifold are the prime suspects.

I know this generator has the Honda GX270 engine. Some have solenoids (Item 49 this link)
http://www.boats.net/parts/search/Honda/Engine/0/GX270%20VPX5%20ENGINE,%20JPN,%20VIN%23%20GCAB-2000001%20TO%20GCAB-9999999/CARBURETOR%20(2)/parts.html
^- No details!

Honda engines by model and VIN can be found here:
http://www.boats.net/parts/search/Honda/Engine/0/parts.html

At this time I think the low oil level sensor (sending uint) may be the culprit causing your problem.
Item 2 this link:
http://www.boats.net/parts/search/Honda/Engine/0/GX270%20VPX5%20ENGINE%2C%20JPN%2C%20VIN%23%20GCAB-2000001%20TO%20GCAB-9999999/CYLINDER/parts.html

Thanks for choosing FixYa,
Kelly

It's either not getting enough fuel, or the govenor is not working. When the engine is running, watch the throttle linkage between the carburetor and engine, looks like a bent wire. When you throw a load on it, it should move to give the engine more power, if it dont, try moving it by hand.
If that appears to be working ok, check the fuel line from the tank to the carb for good gas flow.
You can also remove the float bowl on the bottom of the carb, it's a round bowl on the bottom of the carb with a bolt in the middle of it...clean it out and check the float. The float looks like a little catamaran, make sure it is moving freely up and down. That is about all you can do without removing and cleaning the jets in the carb.

Good luck, & i hope this helps.

Adjustment screw for the governor which is directly related to the engine speed

If the generator is an auto stop/start type for standby use, it would seem those solenoids are the reason why fuel isn't getting through. It would be a fairly sensible method of stopping the engine remotely.

An auto start/stop generator would need a battery for starting purposes, a battery that would presumably also provide current to energise those solenoids and allow fuel to flow.

I suggest you refer to the instruction manual in the first instance...

Hi, You did a good job of diagnosing your problem. Gas in bowl and dry plugs, starts with fluid, But, to quote you, "won't go through carb" . If you feel confident, you should disassemble and clean the carb, as that is going to be the problem. As a tip, if the genset is going to sit make sure to turn off the fuel flow to the engine and run till the engine dies. They do not like to sit any length of time with fuel in the carb. Good Luck, this should Fixya!