Vapor Lock on Toro v-twin

dtestin

Member
Joined
Aug 13, 2017
Threads
13
Messages
33
2015 Toro 74760 24.5hp v-twin (Loncin 708cc) has vapor lock. It will not re-start after it is shut down for a few minutes. Supposedly the engine heat boils the fuel in the carb bowl and carb can't flow fuel to overpower the fuel vapor. Has anyone experienced this? It restarts fine after it has cooled down. I did get it to restart by spraying a bit of fuel into the intake - but not an ideal solution. I am getting spark and it runs great, other than the hot re-start.
 

Tiger Small Engine

Lawn Addict
Joined
Dec 7, 2022
Threads
2
Messages
1,087
2015 Toro 74760 24.5hp v-twin (Loncin 708cc) has vapor lock. It will not re-start after it is shut down for a few minutes. Supposedly the engine heat boils the fuel in the carb bowl and carb can't flow fuel to overpower the fuel vapor. Has anyone experienced this? It restarts fine after it has cooled down. I did get it to restart by spraying a bit of fuel into the intake - but not an ideal solution. I am getting spark and it runs great, other than the hot re-start.
Come up with a way to shield carburetor and fuel line from the engine heat. Aluminum?
 

StarTech

Lawn Royalty
Top Poster Of Month
Joined
Feb 19, 2020
Threads
91
Messages
11,428
I would think it is more likely the fuel is boiling in the fuel line and filter which creates an air lock in the line and the carburetor just runs out fuel. Shielding the line helps but got the get muffler exhaust directed away from the engine compartment. Also using Winter fuel blend during hot Spring months can be a cause too.
 
Top