Egine runs for 15 seconds then quits


Old 09-02-11, 03:39 AM
Thread Starter
Join Date: Sep 2011
Location: USA
Posts: 2
Received 0 Votes on 0 Posts
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
Sponsored Links
Old 09-02-11, 06:19 AM
Join Date: May 2006
Location: Iowa!!!!!
Posts: 4,008
Received 5 Votes on 5 Posts
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.
Old 09-02-11, 10:49 AM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 17,255
Received 22 Votes on 19 Posts
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:
Old 09-02-11, 11:17 AM
Thread Starter
Join Date: Sep 2011
Location: USA
Posts: 2
Received 0 Votes on 0 Posts
Spark Plug it was!

Thanks Cheese. Spark plug it was! Thx everyone...........
Old 09-02-11, 02:04 PM
thethompson's Avatar
Join Date: Jul 2011
Location: USA
Posts: 19
Received 0 Votes on 0 Posts
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.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title: