Always make sure you check the hoses of your car regularly, as they may wear away because of the heat that is in the hood. You should be observant on cracks, loose clamps, hardening, and leakage, and that clamped hoses stay tight. If there are any cracks or blockages in the PCV system hoses inspect them, but proceed to checking if vacuum hoses can actually fit into materials. You can use a small vacuum hose to detect leaks. Before taking out fuel lines, reduce the pressure of the system and search for signs of decay or broken parts. Fuel lines have to be attached using screw clamps designed for your system as well as replace any corroded complex parts. Alternatively, if necessary always examine brake systems thoroughly by first performing a check if metal brake lines are cracked or leaking.