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lawn mower starts but wont stay running


mommyof8plus1's Avatar
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03-01-09, 02:11 PM   #1  
lawn mower starts but wont stay running

We are getting pretty frustrated with this lawn mower. We have replaced spark plug and fuel. It will start but wont stay running. checked the fuel line seems fine carb is getting gas you can see it. I dont even have the airfilter on right now while working on it. Any suggestions help would be appreciated!

 
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03-01-09, 02:15 PM   #2  
Sounds like a fuel issue.....you likely need to tear into the carb. Many small holes that get easily clogged from debris or gummed up gas.....good luck.

PS - make, model, year, maintenance performed would help.....

 
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03-01-09, 02:24 PM   #3  
It is a cub cadet model 18M 173cc engine self propelled.
Year 2007


Last edited by mommyof8plus1; 03-01-09 at 02:25 PM. Reason: add addition info
 
lthj75's Avatar
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03-01-09, 02:48 PM   #4  
Posted By: mommyof8plus1 It is a cub cadet model 18M 173cc engine self propelled.
Year 2007
You run the gas out of it before winter? Sounds like a fuel related issue......carb cleaning would be my next step.

 
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03-01-09, 03:03 PM   #5  
Probably just varnish from old fuel. Get a can of Seafoam from Walmart or an auto parts store and put in the gas.

Drain the fuel from the tank and add a quart with double the concentration of Seafoam recommended on the can for fuel. Start it and let it die a couple of times, then let it sit for about 15 minutes and start it again. Once it keeps running add enough fuel to the tank to bring the fuel/Seafoam mixture up to the recommended and it should be OK. This works about 3/4 of the time for cleaning a carb on engine.

 
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03-01-09, 06:00 PM   #6  
I agree the carb needs cleaning.

 
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03-02-09, 08:20 AM   #7  
Replace Primer Buld

You would be amazed at how many mowers get tossed whenall that is bad is a 2.00 primer bulb. Best way to test is to prime and start engine, if pushing primer buld bor a few seconds keeps it running when it starts to fail.This is the culprit. Takes about 5 minutes to change. I have reclaimed and given away about 6 mowers left by the roadside with this only problem. Good luck. FYI. This part is available at any Lawnmower shop

 
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03-06-09, 06:03 PM   #8  
engine

check gap on plug,(proper plug ?)and use fresh gas,when any small engine sits for awhile the carb will have gum in it,(mostly in the bottom of the float bowl)rebuild if carb is crappy looking(most of the time you don't have to rebuild carb,just remove and clean well and squirt air into the tiny little holes you can see in the carb,also check fuel air mixture on carb setting if these screws are there to adjust,this is a start good luck ............Paul

ps: check float bowl and needle seat,carb may be flooding

 
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