A cooling system after engine shut-down includes a pump, a coolant duct for a coolant, and at least one component to be cooled. The coolant duct is associated with a fuel pump. A cylinder head for an internal combustion engine and a method for operating the cooling system after engine shut-down are provided.

A system and method for preventing a failure of an exhaust heat recovery device are provided. The method includes operating a sole exhaust heat recovery mode when cooling water has a temperature less than a warm-up reference temperature to introduce all exhaust gas flowing from a DPF into the exhaust heat recovery device where the exhaust gas exchanges heat with the cooling water. Additionally, a passage through which the exhaust gas bypasses the exhaust heat recovery device is opened when the exhaust gas at a rear of the DPF has a temperature greater than the warm-up reference temperature during the sole exhaust heat recovery mode.

A temperature control device for the engine may include an air heater configured to heat air introduced into a throttle valve by a flow of engine cooling water, and a valve apparatus configured to cut off the flow of the engine cooling water passing through the air heater at a set temperature range or more, without being supplied with a separate control signal.

A fuel module apparatus is for a marine engine. The fuel module apparatus includes a housing having a fuel cavity and a fuel pump in the housing. The fuel pump is configured to pump fuel through the fuel cavity from an inlet on the housing to an outlet on the housing. A cooling fluid sprayer sprays cooling fluid onto an outer surface of the housing to thereby cool the housing and the fuel in the fuel cavity.

A temperature control device for the engine may include an air heater configured to heat air introduced into a throttle valve by a flow of engine cooling water, and a valve apparatus configured to cut off the flow of the engine cooling water passing through the air heater at a set temperature range or more, without being supplied with a separate control signal.

Various methods and systems are provided for an intake manifold for an engine. In one example, the intake manifold comprises a first passage for supplying intake air to a plurality of cylinders of the engine and a second passage for supplying gaseous fuel to the plurality of cylinders.

An engine fuel and air cooling system for vehicles exchanges heat between a coolant and air conditioning system refrigerant. The system provides a cabin cooling only mode, a cabin and engine fuel and air cooling mode, and an engine fuel and air cooling only mode. A refrigerant distribution manifold distributes the refrigerant for each mode. The engine fuel and air cooling is provided to a supercharger intercooler to cool air provided to the engine, and to fuel rails to cool fuel provided to the engine. In one embodiment the fuel rails include an inner fuel path surrounded by a coolant path to cool the fuel provided to fuel injectors.

A fuel heater and vaporizing system includes a source of fuel, a thermal source from an engine, and a heat exchanger for thermally contacting the source of heated fluid so as to heat fuel flowing through the heat exchanger. The heat exchanger has a saddle shape and fits over the thermal source of engine heat. The fuel heater and vaporizing system may also contain a catalyst for causing the heated fuel to crack prior to distribution to an end use device. In an alternative arrangement, the fuel heater and vaporizing system may also extract its heat from the engine's other heated parts including a muffler or an exhaust pipe, exhaust manifold, valve cover, turbo housing, engine block, transmission and the like.