Kohler cv491s Motor won't start. I replaced the fuel filter. Cleaned the air filter. Poured a fair amount of gas in the carb, opened the thottle to allow the fuel to enter into the bowl. Started the engine and it ran normally for about 30 seconds and then died. I have done this several times with the same result. Could I have a problem with the fuel pump. Would a fuel pump kit resolve this problem?

If this is a motor on a generator, they are usually only run during emergencies. That being the case the gas sits in them. The tank is not a big problem, it's the carb that gets gummed and plugged up. Using the gas that is sold today, most contain ethanol which contains some water. It sounds like the motor is running on what's in the carb and then stalls out for lack of fuel. Changing or removing the fuel filter if there is one may help. On the generator I have, I put a new inline fuel filter in. The generator would start and do the same. I took the fuel filter out and the motor starts and runs. I did have to take the carb apart and clean out with carb cleaner, even ALL the little tine holes in the carb with compressed air and a straight pin. Even though the shop cleaned the carb, they might have removed the fuel bowl on the bottom of the carb which has a needle valve that lets the fuel enter the bowl and gives the motor the initial amount to start and run. They might not have removed the carb and sprayed out the holes in the carb. I would remove the fuel filter and run it that way. If the motor runs then stall, I would remove and clean the carb.

Wow! with all you have done it should run. Be sure the switch is on but if you are getting spark, it should be on. I would take it to the echo place for service.

Potential 'air lock' - try running with out fuel tank cap on
Cap should have a fine breather hole in it

clean/replace air filter

Sounds like the carb is varnished up and needs to be rebuilt. They make rebuild kits depending on the carb number and you can rebuild it.

If the saw briefly runs when you prime the carb and/or cylinder with gas then most likely fuel is not getting thru the carb. Try rebuilding the carb and replacing the fuel filter first. You can also search on youtube and google for troubleshooting tips.

check the solenoid on the bottom of the carb check for movement and power if it moves and has power open the carb and clean it

after a year sitting idle chances are that the gas inside the carb has degraded and the carb will need cleaning also when you filled the tank did you remove any old fuel? if not the its contaminated with the old gas
give it a full service new feul clean carb clean air filter then it should start

hope this helps

john

I had this problem with my Rover Mower a while ago. It nearly drove me mad trying to figure it out. And then I did the only thing I hadn't done so far. I cleaned out the fuel tank. And sure enough, there was a fair amount of gunk in it. And I also cleaned out the filters while I was going...no problems ever since

I had the same mower in my shop with the same prob. Last week, here is what i did to correct the problem, take the fuel line apart at the fuel filter, open the fuel cap and drain the gas from the tank, once it stops i took couple old walmart bags and compressed air to slowly blow air in to the tank to blow the residue and trash out of the fuel tank. Next using compressed air to blow through the fuel line from where the filter was toward the carb. Next unbolt the carb and remove the fuel bowl, take the small pin holding the float out and slowly remove the float pulling strait up as the needle will be attached via a small channel on the float. There is where you will find the seat which the needle you extracted sets in to stop or allow the fuel to flow. Clean these parts and area WELL. i usually take the air screws out and use carb cleaner to clean those areas as well. Reinstall the needle and float, pin assembly and the bowl. Reinstall the carb , and make SURE to install a new fuel filter not exceeding the last filters micron flow, double check all connections, clamps, and hardware, add new FRESH gasoline with no less than 89 octane at any time, engine should fire and run as intended.