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Try the tube that runs between the fuel tank and the carburetor. I have seen them crack since the tank is stationary and the engine is on rubber motor mounts. That line is in constant motion.
I assume you refer to a 6500 watt Honda, if it's electric start/and manual(pull cord) First supply a 12 volt battery /if you haven't put fresh gas in it do the best you can to remove all the old gas from the tank and you should find drain screws and small hoses on the lower part of the carburetor. After completing this step add about 1 gallon or so of fresh gas, remove the air filter system from the face of the carburetor ,with a small squirt bottle put a tea spoon or so of gas into the of the carb, close the choke and turn the key, if it fires let it run with the choke closed for only a few seconds then slowly open the choke fully, if the engine stalls close the choke and start the engine again do not leave the choke closed for extended periods as this will cause engine flooding and spark plug failure. Also be sure you have inspected the existing spark plug to be sure it's clean if there is any question about the plug change it.
find a honda dealer and pray its not expensive... Or find a small engine shop and see if they have some junk generators laying around and buy the best tank they have and make it work...
First of all check to see you have a good spark, If it is running fine under load ignition should not be an issue. If un burnt fuel or over fueling causes the oil / gas to wash down the cylinder walls. I would also perform a leakdown test not a compression test, remove the dipstick and listen for air coming out the crankcase, that will give you an idea if you ahve a ring problem. Also remove the air filter and see if you have any blow back from the carb blowing out where the choke butterfly is. If it has less than 150 hours on it, the rings may also not be seated in, try the above then run it hard on load and check it again
You cleaned the fuel bowl? Was there any dirt, etc, in it? How does the fuel line look? How about the bottom of the fuel tank? How old is the fuel?
From your description, it 'sounds' like a fuel system problem. If it's a Honda EU3000is, it has Electronic Ignition, and electronic ignition usually just goes out all the way, not slowly.
The fuel line is small, and easily obstructed. Does fuel flow when the fuel line is removed from the carburetor? After the generator starts, runs, then dies, remove the float bowl. How much gas is present?
Observe the float. See if it's in good repair. Check the float needle. See if the rubber (Neoprene) tip is squished, or is still in good shape. Could be that when gas fills the float bowl, the float raises, then gets stuck in the up position, cutting off the gas flow.
I have a ems 4500 honda, the gas tank looks like the upper bar needs to be removed to get the gas tank off, it does. Follow the
top bar down on each of the corners. Where the top bar meets with the bar below the gas tank, you will find a bolt in each of the tubes. Take these screws out, use a hammer to tap the top bar upward lightly at each corner. You should see the tubing sliding up out of the bottom tubes.
Your needle/float is stuck, which will allow fuel to flow though the intake...past the piston..and into the crankcase. If has been awhile since you used it, most likely the gas has gummed up the insides of the carb. Otherwise, you may have had something get into the fuel bowl that is keeping the needle from closing. Best way to solve is to remove and clean the carb. Replace fuel filter if needed also. Hope this helps
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