I'd start by adding heat shielding/wrap to fuel lines or carb or rerouting the fuel lines if possible and perhaps use header tape to wrap any exhaust manifolds in fuel line areas to keep exhaust heat away from them. Might be a bit of a hassle to modify your engine/fuel tank for that but that is an option as well. it has an electric fuel pump back by the gas tank beside the fuel filter. The solution back when I was a mechanic was to insulate the fuel line especially where it ran close to the hot engine. In this article, I’ll explain the causes of vapor lock in more detail. This issue occurs because the fuel in the fuel delivery system can overheat and vaporize, preventing fuel delivery to your mower. When I open the fuel tank, I have to force the gas cap off. Vapor lock in lawnmowers generally occurs during hot summer days and result in your mower stalling or simply not working at all. I can fill it up and run about 100 miles and the engine dies. That filter setup was used on some RT 440 and Hemi models to avoid vapor lock issues… Mine got plenty hot under the hood in summer with AC on… The return line offered a path for vapor to bleed off to the tank. There is a lot of things I dont know but I understood vaporlock is caused by the gasoline turning into vapor in the fuel supply line causing a bubble so fuel refuses to flow. I am getting a vapor lock on my fuel tank. I use to own a 69 Charger RT 440 with AC and they had a special fuel filter design with 3 fuel lines at the filter… One from the fuel pump, one from the filter to the carb and one return line from the filter to the fuel tank. first time here I have a 2003 Santa fe when I fuel up then try to start the car it seems vapor locked have crank it and pump the gas a few times then it.
GAS VAPOR LOCK INSTALL
Another thing to try is to install a thermal spacer plate between the carb and engine… Some are just made of a phenolic resin that mount in place of the carb base gasket and some have a metal heat shield incorporated into them to block engine heat getting to the carb fuel bowl. The higher the temperature, the higher the altitude, the more likely it is that Gasoline vapors build a vapor lock, preventing the fuel in the line from moving to the engine. Or reroute the fuel lines if possible away from heat sources like exhaust manifolds. This then effects the operation of the fuel pump which.
The wrapping will reduce any heat transfer from the engine to the fuel line and reduce the chances of vapor lock. Vapor Lock in vehicles is when the liquid form the fuel changes its state to gas whilst in the system. I would try wrapping the metal fuel lines near the engine with thermal resistant heat shielding tape… Or called exhaust / header tape… Sold at parts stores or speed shops, online, etc… Some people just use aluminum foil to wrap fuel lines with limited results in blocking heat transfer.
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