Rajan Wilcox
Vapor lock is a phenomenon that occurs when the temperature of the fuel rises to a level that transforms it from a liquid to a gaseous state. As fuel pumps are designed to pump liquids, this can cause the engine to stall. This typically happens during the summer months when the heat from the engine and exhaust, combined with high outdoor temperatures, cause the fuel to heat up. To prevent vapor lock, it is important to protect the fuel lines from getting too hot. This can be done by using a thermal-barrier sleeve on the fuel lines, such as the Heat Shield Sleeve from Heatshield Products, which has a built-in, high-temperature fastening system. Other solutions include installing an electric fuel pump, using a heat barrier type tape, or insulating the fuel lines with a rubber hose.
How to insulate a fuel line to prevent vapor lock
| Characteristics | Values |
|---|---|
| What is vapor lock? | The transformation of liquid fuel into vapour due to high temperatures |
| What causes it? | Heat from the engine and exhaust, high outdoor temperatures, high altitude |
| What happens? | Fuel starvation, engine runs rough or stalls |
| Solution | Protect fuel lines from getting hot, use a thermal-barrier sleeve, e.g. Heat Shield Sleeve from Heatshield Products |
| Other solutions | Install an electric fuel pump, use a heat barrier tape, install a set of gaskets that block off the exhaust crossover port, use a fuel line heat sink |
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What You'll Learn
Using a thermal-barrier sleeve
Vapor lock occurs when the temperature of the fuel rises and transforms from a liquid to a vapour state. 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. This results in fuel starvation, causing the engine to run roughly or completely stall. This typically happens during the summer months when high outdoor temperatures combine with the heat of the engine and exhaust.
One of the easiest ways to prevent vapor lock is to use a thermal-barrier sleeve on the fuel lines, such as the Thermaflect Sleeve from Heatshield Products. These sleeves are designed to go over your fuel lines, whether they are steel, rubber, or braided, to shield them from damaging engine bay heat that causes vapor lock. The Thermaflect Sleeve has a built-in, high-temperature hook-and-loop fastener system, which makes installation easy as you don't need to remove the fuel lines. A roll of the sleeve can also be cut to various lengths, so different sections of the fuel lines can be protected.
The Lava Tube from Heatshield Products is another great solution for keeping fuel lines cool. It features a built-in, high-temperature, hook-and-loop fastening system that allows for simple installation on lines, linkages, and wiring harnesses, even those already installed.
In some cases, installing a thermal-barrier sleeve under your vehicle where the fuel lines run next to the frame rails or floor pans may be difficult or impractical. In these cases, Sticky Shields can be used around fuel tanks to protect them from heat, keeping the fuel in the tank cooler and less susceptible to increased temperatures that could affect fuel-pump operation.
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Installing an electric fuel pump
Vapor lock occurs when the temperature of the fuel gets high enough to transform from a liquid to a gaseous state. Fuel pumps are designed to pump liquid, not air, and the increased pressure inside the fuel lines can prevent fuel from reaching the engine. This problem is more common in the summer months and in older vehicles, particularly those with mechanical fuel pumps. Modern fuel blends also have a lower boiling point, which makes them more susceptible to vapor lock.
To prevent vapor lock, you can install an electric fuel pump to push the fuel, instead of sucking it. This is a more effective solution than simply insulating the fuel line, which can actually trap heat inside. If you want to stick with a mechanical pump, you can try using a black nylon braided fuel hose and routing it away from all heat sources. You can also install an inline electric pump to pressurize the fuel up to the inlet side of the mechanical pump, but this won't address the issue on the low-pressure side of the pump.
- Purchase a suitable electric fuel pump for your vehicle. Make sure to check the voltage requirements and ensure it is compatible with your fuel system.
- Remove the old fuel pump. This may involve draining the fuel tank and disconnecting the fuel lines, as well as removing any mounting hardware or brackets holding the pump in place.
- Install the new electric fuel pump. Follow the manufacturer's instructions for mounting and connecting the pump. Ensure that all fuel lines are securely attached and that there are no leaks.
- Prime the fuel pump by running it for a few seconds before starting the engine. This will ensure that the pump is circulating fuel and will help to prevent vapor lock.
- Test the vehicle to ensure that the electric fuel pump is functioning properly. Pay attention to any unusual noises or performance issues, and check for any signs of fuel leaks.
- Consider adding additional cooling measures, such as a heat sink or a thermal-barrier sleeve, to further protect against vapor lock.
By following these steps and consulting vehicle-specific instructions or a mechanic, you can effectively install an electric fuel pump to prevent vapor lock.
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Applying heat-barrier tape
Vapor lock happens when the temperature of the fuel gets high enough to transform it from liquid to vapour. Fuel pumps are designed to pump liquid, not air, so vapor lock effectively starves the engine of fuel. The solution is to protect the fuel lines from getting hot in the first place.
Heatshield Products offers a range of thermal barriers to prevent vapor lock. One of the easiest solutions is to use a thermal-barrier sleeve on the lines, such as a Thermaflect Sleeve or a Lava Tube thermal-barrier sleeve. The Lava Tube is made from a specially formulated, volcanic rock-based thermal-barrier material that’s designed to block heat and resist damage from solvents and fluids. It can be cut to the required length with heavy-duty scissors. You will need to seal the ends of the barrier tightly around the hose and fittings to prevent heat from seeping in.
Another product offered by Heatshield Products is the HP Sticky Shield, which can be used around the fuel tank to keep the fuel cooler and protect the tank from the heat generated by the exhaust system.
Vapor barrier tape is another product that can be used to minimize heat transference. It is usually a sufficient vapor barrier and can be used to seal, seam, and repair vapor barriers. Polyethylene sealing tape, fiberglass cloth tape, insulation seaming tape, and fiberglass insulation tape are all examples of vapor barrier tapes. When applying the tape, it is important to patch up any holes, tears, and seams and to squeegee the tape into the nooks and crannies of the surface. It is also important to avoid touching the tape and to add another 2-3 layers to ensure optimum durability and strength.
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Using a heat shield
Vapor lock occurs when the temperature of the fuel gets high enough to transform it from a liquid to a vapour. As fuel pumps are designed to pump liquid, not air, the increased pressure inside the fuel lines prevents the fuel pump from being able to keep the fuel moving, starving the engine of fuel. This can cause the engine to run roughly or stall. This issue is more common in the summer months, when the high ambient temperatures, combined with the heat of a vehicle's engine and exhaust, are transferred to the fuel lines.
To prevent vapor lock, you can use a thermal barrier like a heat shield or heat sleeve to protect your fuel lines from getting hot. Heatshield Products offers a range of thermal barriers, including the Thermaflect Sleeve, which can be used to protect exposed steel and rubber fuel lines in an engine compartment from ambient heat. The Thermaflect Sleeve has a built-in, high-temperature hook-and-loop fastener system, which makes installation easy as you don't need to remove the fuel lines. It can also be cut to various lengths to protect different sections of the fuel lines. Another product offered by Heatshield Products is the Lava Tube thermal-barrier sleeve, which is made from a volcanic rock-based material that blocks heat and resists damage from solvents and fluids.
In addition to using heat sleeves on the fuel lines, it is also important to protect the fuel tank itself from heat. Heatshield Products offers the HP Sticky Shield, which can be used around the fuel tank to keep the fuel cooler and protect it from the heat generated by the exhaust system. This will help to prevent the fuel in the tank from reaching high temperatures that could affect fuel-pump operation and lead to vapor lock.
Another option for carb-equipped vehicles is to use a Phenolic carb spacer or a "thick" carb gasket to create space between the carb and the engine, reducing the heat transfer to the fuel lines. Additionally, ensuring that fuel lines are securely mounted and routed away from high-temperature components like exhaust systems or engine parts can help prevent vapor lock. Regular inspection and maintenance of the fuel lines are also important to prevent damage and maintain their integrity.
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Relocating the fuel line
To prevent vapor lock, it is important to protect your fuel lines from getting too hot. One way to do this is by relocating the fuel line away from the engine and header tubes, as they are a source of heat. This can be done by installing a spacer or a gasket to lift the carburetor and create some distance between the fuel line and the heat source.
Another way to relocate the fuel line is by moving the fuel pump to the interior of the fuel tank. This helps prevent vapor lock since the entire fuel delivery system is under positive pressure, and the fuel pump runs cooler than it would in the engine compartment. This method is commonly used in modern engines with fuel injection systems.
Additionally, insulating the fuel line with a wrap or sleeve can also help to prevent vapor lock. This creates a barrier between the fuel line and the heat source, keeping the fuel cooler. However, this method may not be feasible if the fuel lines are located in a difficult-to-access area.
By relocating the fuel line and implementing other preventative measures, such as using a thermal-barrier sleeve or moving the fuel pump, you can effectively reduce the chances of vapor lock occurring in your vehicle.
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Frequently asked questions
Vapor lock is when the temperature of the fuel gets high enough to transform it from liquid to vapour. Since fuel pumps are designed to pump liquid, not air, vapour lock effectively starves the engine of fuel, causing the engine to run rough or completely stall.
The solution is to protect the fuel lines from getting hot in the first place. For carb-equipped vehicles, one of the easiest solutions is to use a thermal-barrier sleeve on the fuel lines, such as the Heat Shield Sleeve from Heatshield Products. Alternatively, you can use HP Sticky Shield around the fuel tank to keep the fuel cooler.
You can use an engine heat shield or a heat barrier type tape to wrap the fuel line from the pump to the carb. You can also install an electric fuel pump to push the fuel, instead of sucking it.
Vapour lock typically happens during the summer months when high outdoor temperatures are combined with high engine and exhaust heat. Your engine will run rough or completely stall.
