What is a fuel system vapor lock?
Quick Answer
A fuel system vapor lock is when the fuel in a vehicle changes from a liquid to a gas state while it is still in the fuel lines. If the fuel is in a gaseous state in the fuel lines, the fuel pump can't push liquid fuel to the engine.
Continue ReadingFull Answer
A vapor lock is typically caused by the fuel overheating somewhere in the fuel delivery system. The problem is most common on gasoline powered carbureted engines that have a mechanical fuel pump in the engine compartment. Excessive heat due to weather conditions, engine overheating or high-altitude driving, which reduces the boiling point are common causes. Gasoline with a higher ethanol content is more volatile and can be a contributor as well.
Vehicles affected by vapor lock tend to run roughly, sputter and die. Typically, the engine doesn't start until it has cooled down. Fuel-injected vehicles with an electric fuel pump located in the fuel tank are less susceptible to vapor lock.
Learn more about Car Parts & MaintenanceRelated Questions
-
Q:
How do you remove a fuel pump?
A: Replace the fuel pump in a car by relieving the pressure from the fuel lines, disconnecting the battery, draining the fuel tank and removing the back seat ... Full Answer >Filed Under: -
Q:
What are some tips for removing rust from a gas tank?
A: Tips for removing rust from a gas tank include parking the vehicle in a place that is free of clutter and flammable items, draining all fuel from the tank,... Full Answer >Filed Under: -
Q:
How do you replace fuel injectors?
A: To replace fuel injectors, depressurize the fuel system, and remove the fuel lines from the injectors or fuel rail. Remove the injectors with a fuel inject... Full Answer >Filed Under: -
Q:
What problems can a missing or damaged gas cap cause?
A: The most common issue caused by a damaged, cracked or missing gas cap in modern vehicles is that it inhibits the fuel system's vapor evaporation system, wh... Full Answer >Filed Under:
