Fuel and oil hoses must be secured at all mounting points with high quality hose clamps, you won't be the first to have a gigantic leak or a car whose entire engine compartment has burnt out because of badly mounted hoses.
The heating and ventilation pipes are also secured in many places by hose clamps, not only to prevent leakage, but also to prevent air leakage, which reduces the operation of the heating and/or ventilation system.
The hose clamps mentioned here are universal and have a smooth inner side, unlike many economical alternatives with serrated edges that can damage the hose. The clamp is tensioned by a worm screw
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