vapour lock
LowTechnical
Definition
Meaning
A condition where gasoline vaporizes in the fuel lines of an internal combustion engine, preventing liquid fuel from reaching the carburetor or fuel injectors, causing the engine to stall.
Any situation where the flow of a liquid is obstructed by the formation of vapour or gas bubbles, causing a blockage or failure in a system. Figuratively, can describe a mental or procedural blockage.
Linguistics
Semantic Notes
Primarily a technical term from mechanical/automotive engineering. The figurative use is a metaphorical extension and is less common.
Dialectal Variation
British vs American Usage
Differences
UK spelling is 'vapour lock', US spelling is 'vapor lock'. Concept is identical.
Connotations
Identical technical meaning. The figurative use is more likely in US business/informal contexts.
Frequency
More frequent in US English due to larger historical car culture and hotter climates exacerbating the problem. Recognized in UK English but less commonly experienced.
Vocabulary
Collocations
Grammar
Valency Patterns
The [engine/system] suffered from vapour lock.Vapour lock [caused/prevented/stopped] the [flow/process].To avoid/eliminate vapour lock in the [fuel line].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “My brain's got a vapour lock. (figurative, informal: I can't think.)”
Usage
Context Usage
Business
Rarely used. Possibly metaphorical: 'The project hit a vapour lock when the funding stalled.'
Academic
Used in engineering texts, specifically automotive and fluid dynamics.
Everyday
Rare. Mostly used by car enthusiasts or mechanics.
Technical
Standard term in automotive repair manuals and mechanical engineering.
Examples
By Part of Speech
verb
British English
- The classic car tends to vapour-lock on very warm days.
- I was worried the fuel line would vapour-lock in the traffic.
American English
- If you don't have a heat shield, your engine might vapor-lock.
- Older models vapor-locked frequently.
adverb
British English
- The car failed vapour-lockingly in the summer heat. (extremely rare/constructed)
American English
- (No standard adverbial form in use.)
adjective
British English
- It's a vapour-lock issue.
- We installed a vapour-lock prevention kit.
American English
- The vapor-lock condition stranded us.
- He diagnosed a vapor-lock problem.
Examples
By CEFR Level
- (Not applicable for A2 level technical term)
- The old car stopped because of a vapour lock.
- Hot weather can cause vapour lock.
- The mechanic explained that vapour lock was preventing fuel from reaching the engine.
- To avoid vapour lock, they rerouted the fuel line away from the hot manifold.
- The persistent vapour lock in the fuel-injection system was traced to inadequate insulation near the exhaust.
- Figuratively speaking, the committee experienced a kind of intellectual vapour lock, unable to proceed with the proposal.
Learning
Memory Aids
Mnemonic
Imagine a lock on a canal (the fuel line). Instead of water, it's filled with steam (vapour), so the boat (fuel) can't get through. Vapour lock = vapour blocks the lock.
Conceptual Metaphor
BLOCKAGE IS A LOCK; MENTAL DIFFICULTY IS ENGINE FAILURE.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid literal translation 'парный замок'. The correct technical translation is 'паровая пробка' or 'завоздушивание топливопровода'. Figurative use has no direct equivalent.
Common Mistakes
- Spelling confusion ('vaporlock' as one word). Using it to describe any engine stall. Misapplying it to diesel engines (which are less prone to it).
Practice
Quiz
In which scenario is 'vapour lock' most accurately used?
FAQ
Frequently Asked Questions
Primarily, yes, for gasoline-powered internal combustion engines. However, the principle can apply to any system where a liquid is meant to flow but vaporizes and blocks the flow, such as in some plumbing or hydraulic systems.
They are opposites. Vapour lock is a lack of liquid fuel due to vaporization. Flooding is an excess of liquid fuel, making the air-fuel mixture too rich to ignite.
It's much less common. Modern cars have pressurized fuel injection systems (often with electric pumps in the tank) and better engine bay heat management, which greatly reduces the risk compared to older carburetted cars.
Typically, you allow the engine to cool. You can also try to cool the fuel lines with a damp cloth. Long-term fixes include installing heat shields, rerouting fuel lines, or using fuel additives designed to lower volatility.