Incidence With Other Fuels
The higher the volatility of the fuel, the more likely it is that vapor lock will occur. Historically, gasoline was a more volatile distillate than it is now and was more prone to vapor lock. Conversely, diesel fuel is far less volatile than gasoline, so that diesel engines almost never suffer from vapor lock. However, diesel engine fuel systems are far more susceptible to air locks in their fuel lines, because standard diesel fuel injection pumps rely on the fuel being non-compressible. Air locks are caused by air leaking into the fuel delivery line or entering from the tank. Air locks are eliminated by turning the engine over for a time using the starter motor, or by bleeding the fuel system.
Modern diesel injection systems have self-bleeding electric pumps which eliminate the air lock problem.
Read more about this topic: Vapor Lock
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