![]() ![]() So, what’s a vehicle enthusiast with a carbureted engine to do? There are several ways to solve vapor lock problems, including installing an electric fuel pump or adding a plastic carb spacer. Finding the Best FixĪs you can imagine, under-hood temps get much higher on the street than they did in our test. Unfortunately, modern fuel blends can boil at temps as low as 100 degrees. In our test, with an ambient temperature of 70 degrees Fahrenheit, the temp of the line reaches just 120 degrees. Once the engine compartment heats up, though, the fuel starts to boil and air bubbles form. This allowed us to see the hose filling with fuel, with no air bubbles present. To confirm a vapor lock problem, we installed a clear hose from the fuel pump to the carburetor inlet. After sitting for an hour or two, it will start again and run with no apparent problems. Once it’s been shut off, however, it won’t restart. It’s got a mechanical fuel pump and a 4-barrel carburetor and runs fine. In this example, the team is working on a 1960 Chevy Impala street cruiser with a 350-HP engine belonging to a North Carolina customer. In a case where vapor lock is suspected, definitive diagnosis is key. Its boiling point is much lower than fuel blends of the past, and it’s more volatile. This problem has really ramped up in the last few decades because modern fuel is designed for fuel-injected engines and electric fuel pumps. It commonly occurs when a car has been idling or has been turned off and then back on. ![]() Vaporized fuel creates back pressure in your fuel system and prevents gas from getting to your engine. Vapor lock happens when your fuel boils in your carburetor or your fuel line. There’s a reason why old-school car guys might not make the leap to vapor lock. In our video on vapor lock, Eric LaBore explains how the fuel itself can cause problems and how Prestige Motorsports addresses the root causes of vapor lock. ![]() At Prestige Motorsports, we see these symptoms all the time, and the cause is always the same. It is also highly suited for use with the Rotor-Gene Q cycler.Is your car suddenly running rough or stalling out in warm temperatures? Does it need to sit for hours before it’ll start after you shut it off? These issues are common, and they’re often blamed on carburetors. Vapor-Lock is fully compatible with the QIAgility instrument for high-precision, automated reaction setup. The background fluorescence of Vapor-Lock is less than one fluorescence unit (see figure " Minimal autofluorescence of Vapor-Lock"). In contrast to mineral oil, Vapor-Lock does not contaminate or inhibit PCR. Vapor-Lock overlays the samples, preventing evaporation and increasing the reliability of results. Vapor-Lock completely eliminates the need for caps which accelerates reaction setup. Long reaction setup times, which can occur when working with large numbers of samples in strip tubes or multiwell plates, increase the risk of sample evaporation which can compromise the success of an experiment. Vapor-Lock has low viscosity and low specific gravity, allowing aqueous droplets over approximately 1 µl to drop easily through the Vapor-Lock layer to the aqueous sample underneath. It sits above the aqueous phase, forming a layer on top of the aqueous sample (see figure " Principle of Vapor-Lock"). Vapor-Lock looks and behaves like aqueous buffer. Vapor-Lock prevents evaporation, ensuring high success rates in precision applications such as quantitative real-time PCR and high-resolution melting (HRM). Evaporation can occur during thermal cycling, resulting in changes in the reaction volume and the concentration of each reaction component. ![]()
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