When vented fuel tanks become blocked and fuel flow is disrupted,is that called a vapor lock?

Question

When vented fuel tanks become blocked and fuel flow is disrupted,is that called a vapor lock?

Answer 1

No, vapor lock was an old problem associated with mechanical fuel pumps that were attached to the engine block.  

When parked with the engine hot, the pump would pick up so much heat conducted from the block that it would vaporize the fuel in the pump.    Attempting to re-start and run the engine, would often result in no fuel being delivered to the carburetor because the pump was operating in air and couldn't create enough pressure to push the fuel up (they were usually mounted low on the block) to the carb.  

What you are referring to is more of a "vacuum" lock (not sure if there's a term for it, but that will suffice for this message), where the negative pressure in the tank exceeds the pump's capacity to overcome it.   In extreme cases, I've heard of a fuel tank partially collapsing from the vacuum.

Answer 2

No.

Answer 3

No, a vapor lock is usually associated with reciprocating propeller driven engines. A vapor lock is engine oil that is blocked within the cylinder which usually is the 9th cylinder because it is on the bottom of the engine. Forcing the prop will only cause a bent piston rod. The way to fix it is to remove that cylinder's spark plug and then turn the prop by hand which will force the blocking oil out of the cylinder, reinstall the spark plugs and your're ready to go.

Answer 4

No. Vapor lock happens when a fuel line is routed near an extremely hot area (near the exhaust manifold, or if it sits close to the engine block for a period of time) the fuel inside the line turns to vapor from the heat. Vapor lock can be a problem on carburated vehicles, but I've never heard of it happening on a fuel-injected motor.

Answer 5

no,blocked vent line or vacum lock . which then leads to a non positive gravity feed to the boost pump . due to  to the vacum lock Then leads to over heating the boost pump and no feed to the engine fuel pump.  The you start saying oh #$#