Bypass temperature control valve, fuel filter and engine oil supply system

The invention relates to the field of vehicles, and discloses a bypass temperature control valve, a fuel filter and an engine oil supply system. According to the bypass temperature control valve, in the diesel oil cooling process, the sealing rod is gradually reset, the diesel oil liquid level in the fuel oil filter is gradually reduced, due to the fact that when the sealing rod is located at the high-temperature pressure relief position, the external oil opening communicates with the assembly space, and in the sealing rod resetting process, the liquid level in the assembly space is basically as high as the liquid level in the pre-filtering oil cavity; the sealing rod is gradually reset along with continuous reduction of the temperature in the pre-filtering oil cavity, so that most fuel oil in the assembling space is returned into the pre-filtering oil cavity from the external oil port before the sealing rod moves to the proper-temperature blocking position, and when the sealing rod moves to the proper-temper