The high temperatures under the hood, therefore, demand that rubber and plastic hoses be inspected regularly in the engine, accessory and emission systems to prevent deterioration. Material hardening ,leaks,crracks and looseness of clips should be sought for. Since most hoses are clamped they should always be kept in tension all time so that no leaks can occur .In addition there is need to check hoses without clamps as they may expand or harden thus potentially causing leakage.To avoid destructions by obstructions and damage it needs to be checked for this.Whereas vacuum hoses which usually have various color codes for identification are variable in wall thickness, collapse resistance and temperature resistance among others.Vacuum hoses should be replaced with ones of similar composition. Plastic t-fittings attached with these lines are likely to crack or deform .One only requires a few inches of a vacuum hose which can serve as a stethoscope of sorts by listening for any hissing sounds that accompany a vacuum leak.Vigilance is necessary when handling fuel hoses operating under pressure to determine their condition prior to installation as well as replacement since they are prone to chafing and cracking because of their current state.Spring type fasteners should not be used again on changing the hose but screw fasteners.Discover if metal tubes made from elongated steel pipes are bent broken or folded. If you have to replace them use seamless steel tubing instead .It also adds up that brake fluid will seep through when there is leaking in-between the lines posing great risks.