![]() And, if you have a show vehicle and need heat protection without compromising the restored look, the Thermaflect Sleeve can be removed! A roll of Thermaflect Sleeve can be cut to various lengths, so different sections of fuel lines can easily be protected. Our engine heat shield sleeves have a built-in, high-temp hook-and-loop fastener system which prevents needing to remove fuel lines and makes installation a breeze. For carb-equipped vehicles, one of the easiest solutions to preventing vapor lock is to use a thermal-barrier sleeve on the lines such as a Thermaflect Sleeve from Heatshield Products. The solution? Protect your fuel lines from getting hot. Vapor lock typically happens during summer months when high ambient temps, combined with the heat of a vehicle’s engine and exhaust, is transferred to the fuel lines. 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. Vapor lock happens when the temperature of fuel gets high enough to transform liquid into a vapor state. But, proper use of thermal barriers is helpful in preventing vapor lock, no matter how hot the day gets. ![]() If you’re a racer, it can put the car on the trailer well before you’re ready to leave the track. ![]() Whether you have a carburetor or use fuel-injection in your vehicle, vapor lock can bring your vehicle to a standstill causing hours of frustration. If you’re wondering how to prevent vapor lock, try using a thermal barrier like a heat shield, or heat sleeve. An impact shut off switch or shut off switch actuated by the oil pressure switch may be installed for added safety if you wish.How To Prevent Vapor Lock Using Thermal Barriers The light brown wire on the pump attaches to a 12V power source controlled by an on off switch installed in a location of your choice. The pump has a wrap around mount bracket that requires one mount bolt which can also be used as a ground for the pump (black wire). It is not necessary to drill a mount hole because a hole already exists in the brace. They are designed to allow fuel to pass through when the mechanical only pump is in use and can be used to augment the mechanical pump when the engine starts to surge at the onset of a vapor lock… I recommend installing the electrical pump in the fuel line on the out board side of the frame inside the second frame to floor brace away from any heat source. It is installed for back up and used only to over come a vapor lock if necessary or cold starts if the vehicle has been setting for a long period of time especially on 1955/56 models. I recommend an inline pump similar to the one pictured, which was purchased from Car Quest Auto Parts P/N E8016S. If you feel it is necessary to by pass the mechanical pump should it fail a by pass hose can be fabricated and carried to be installed if you desire. I do not recommend by passing the mechanical fuel pump when an electrical pump is installed. ![]() Electric fuel pumps are designed to push fuel and they loose efficiency when pulling fuel from the tank. If the electric pump is installed in the engine compartment they act as a heat sink which can cause a vapor lock. They should never be installed in the engine compartment for two reasons, distance from the tank and excessive heat from the engine. They should be installed as close to the fuel tank as possible. Stainless steel fuel lines, although they look great, absorb more heat and can also contribute to a vapor lock.Īn electric fuel pump can eliminate a vapor lock when properly installed and I stress when properly installed. They can also occur in the fuel line from the tank if the fuel line is too close to the tail pipe as it passes over the frame. Most vapor locks occur in the engine compartment of our Thunderbirds. Most fuel we purchase today contains ethanol which adds to the possibility of a vapor lock especially in hot weather and during sustained loads while driving over steep terrain. Vapor locks usually occur in automobile fuel systems between the tank and carburetor. Vapor locks are created in fuel systems when excessive heat turns liquid fuel into a non liquid vapor. ![]()
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