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craftsman lawn mower vapor lock?

NewGuy3's Avatar

Join Date: May 2014
Posts: 6

07-03-14, 10:17 AM   #1  
craftsman lawn mower vapor lock?

I have a Craftsman 22" self propelled lawn mower. With a Briggs & Stratton motor I believe.

Starts right up when cold or even sitting all winter.
One or 2 pulls and it starts right up.

Never dies out cold or hot.

When I do shut it off when hot and want to restart it 15-30 minutes later etc it is a PITA to get started again. it will take 50 pulls or a heart attack (whichever comes first) to get it started.

I assume a vapor lock but not sure how to correct it or what I need to check first?


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Pilot Dane's Avatar
Group Moderator

Join Date: Mar 2003
Posts: 16,683

07-03-14, 11:30 AM   #2  
Can you post what engine you have (model number) so we can tell what carburetor you have?

Have you tried different starting methods when it's hot? Have you tried hot starting with the throttle partially or all the way open? Some engines need priming or choking when cold but that will prevent them from starting when hot.

NewGuy3's Avatar

Join Date: May 2014
Posts: 6

07-03-14, 12:14 PM   #3  
Not sure if this is what your looking for but in the owners manual it says:
Engine, Briggs & Stratton,
Model Number
Sears part number for the carburetor is 498170

The lawnmower model # is 917.376660

michaelrj9's Avatar

Join Date: May 2006
Posts: 71

07-14-14, 03:38 PM   #4  

If anyone has any suggestions that would be great.

cheese's Avatar
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Join Date: Jul 2001
Posts: 16,567

07-14-14, 11:23 PM   #5  
There are several threads recently about this problem. Poor design, the only reasonable workaround so far is to tilt the mower carb side up to let a little gas enter the intake, then it wills tart right up.

"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

geogrubb's Avatar

Join Date: Jun 2006
Posts: 2,333

07-15-14, 09:04 AM   #6  
I noticed on the sears site the original 498170 carb number has been substituted with a 799868 so maybe they found the problem. Have a good one. Geo

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