Egine runs for 15 seconds then quits

I have a Husqvarna 55R21HV lawn mower with a Honda engine 3HNXS.1871AK I believe a 5hp. It will fire up for 15 seconds and then dies. I have fresh gas, I took the carb. off and inspected it very well. Still can't find the problem. Anyone have any trouble shooting suggestions! Thx

 

Does it repeatedly start and die - can you start it say five times in a short time with the same results or does it have to sit for an hour or so before it restarts?

Normally if it's a coil acting up they run longer, act up a little and die without restarting right away. Fuel issues do what you're describing. It can be a plugged vent in the gas tank cap or a restriction in the fuel line/filter or in the outlet of the tank itself or in other parts of the fuel system.

If you have a partial tank of fuel - say half a tank - it isn't likely the fuel cap since the air in the tank would allow the fuel to flow for longer than 15 seconds. If you have a tank completely full it could be a lugged cap vent.

Pull the inflow line from the carb and see if have a good consistent flow from the tank. If you have a fuel pump on the engine to pull from a tank sitting below the carb, spin the engine over to drive the pump. Either way you need fuel coming from the line.

If you have fuel in a good flow that leaves the carburetor. It will have to be removed, cleaned, preferably in a soak solution, although cleaning can be done with a good aerosol cleaner.

 

Start with a new spark plug. Something about the NGK plugs that come in these things causes this. Might not be the problem, but it very well could be. Here is a thread about the problem: http://www.doityourself.com/forum/ou...tting-out.html

 

Thanks Cheese. Spark plug it was! Thx everyone...........

 

glad you figured out what it was. mine used to do the same thing! and you know what? it was the dag on spark plug too.