As this happens, the engine will gradually receive less and less fuel, causing the engine to sputter. As the fuel begins to heat, it creates small bubbles in the fuel system that slowly start to affect the lawn mower’s engine. 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. Vapor lock on a lawn mower is a gradual process that slowly worsens as the gas builds up. Vapor lock generally occurs when the fuel (usually gasoline) within the fuel delivery system overheats and vaporizes too rapidly. Carbureted and air-cooled engines are especially prone to this condition, especially on extremely warm summer days. The result is fuel starvation causing the engine to run rough or completely stall. Fuel pumps are designed to pump liquid, not air, and the increased pressure inside the fuel lines keeps the fuel pump from being able to keep the fuel moving. I opened the hood and it looked all good, 7 PSI of pressure, so i pumped the gas. Vapor lock happens when the temperature of fuel gets high enough to transform liquid into a vapor state. Might be a bit of a hassle to modify your engine/fuel tank for that but that is an option as well. These symptoms are indicative of 'vapor lock'. I was driving and all of a sudden the motor died, and i pulled off the road. 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. 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. When compared to carburetors, fuel injection offers serious benefits like improved efficiency and less maintenance. 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. Vapor lock is usually caused by overheating, so the solution is to lower the temperature of the fuel system. Or reroute the fuel lines if possible away from heat sources like exhaust manifolds. The wrapping will reduce any heat transfer from the engine to the fuel line and reduce the chances of vapor lock. 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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