#VAPOR LOCK FULL#

Regarding ignition modules and other electronic components: many, many times as electronic components heat up, if they have a flaw or have grown old they will misbehave. Then after 30 minutes or so, I'll try to start it and it's fine until it's been running 30 minutes or longer and then it happens again.ĭoes it need a pressure regulator or a heat shield to protect the fuel line or does the carb needle value need to be changed or reset to keep the engine from flooding? Please answer as soon as possible.

#VAPOR LOCK FULL#

I opened the hood and the inline glass fuel filter might be empty or full of fuel, but the car has trouble starting when this happens.Īlso, after running and shutting off all by its self like it has no fuel. Sometimes the car runs for 30 minutes or so then starts to die, like a vapor lock or flooding the carb. It has a 350 small block carb engine and smells like it's getting too much fuel. My hot rod Corvette has low gasket pressure in the electric fuel pump. I had a 1968 Roadrunner that I used to drive a lot in the summer when the temps got well into the 90's.

The amount of fuel that is delivered to the engine can be changed using simple mechanical adjustments on the carburetor. A carburetor, on the other hand, is a mechanical device that uses the engine’s natural vacuum, allowing specific amounts of fuel to be sucked into the combustion chambers. Fuel injection is more advanced, and requires a computer to tell the injectors how much gasoline to squirt into the engine. Carburetors and electronic fuel injection are two different methods of delivering the proper amounts of fuel to the engine. Vapor locking primarily happens in cars with carbureted engines, but since electronic fuel injection replaced carburetors in the 1980s, most car owners don’t have to deal with this issue anymore. This problem causes a car to stop running when the fuel lines overheat cars sitting on the side of the road with their hoods raised used to be a common sight, particularly on hot days. Appendix 1 treats the subject of the apparatus for temperature measurements Appendix 2, the water-displacement system used to protect the special test fuels from 'weathering.Owners of older cars can add newer low-pressure electric fuel pumps near their tanks to help prevent vapor lock.Īlthough vapor lock is not often seen in modern cars, it was a common problem with the carbureted cars of past decades. A detailed summary of the paper is made, and conclusions are drawn. Other features are the measurement of the vapor-handling capacity of fuel systems and fuel-system-loss measurements. Fuel-system temperature-tests are described and data thereon presented. Vapor lock may take the form of an excessively lean mixture supplied to the engine, if the gasoline boils in the carburetor jet or it may take the form of an excessively rich mixture, if gasoline vapors in the float chamber build up sufficient pressure to drive fuel through the jet, a characteristic frequently described as 'percolation.' The two important classes of car operation which may produce vapor lock, that is, 'running vapor lock' and 'idling vapor lock,' are discussed, an analysis of vapor lock in fuel systems is made, and gasoline vapor-locking characteristics are treated. THIS paper defines vapor lock as any interruption to the normal metering characteristics of a carburetor, due to vaporization of the fuel before passing through the carburetor jet.