at what temperature does diesel fuel start to jail
Gel point (petroleum) Gel point is the temperature at which diesel or biodiesel fuel freezes solid and can no longer flow by gravity or be pumped through fuel lines. This phenomenon happens when a fuel reaches a low enough temperature whereby enough wax crystals have formed to prevent any movement in the oil. For #2 diesel this is usually around 17.5 °F (−8.1 °C).
Vapor lock The fuel can vapourize due to being heated by the engine, by the local climate or due to a lower boiling point at high altitude. In regions where fuels with higher volatility are used during the winter to improve engine startup, continued use of the specialized fuels during the summer can cause vapour lock to occur more readily.