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It is the job of the Head Gasket to make sure that none of these respective parties: Engine Oil/âSharksâ, Coolant/âJetsâ, and air, fuel and exhaust/ârest of the partyâ ever mix with each other. When the head gasket leaks or fails â then one or more of these elements can mix â which leads to a myriad of issues. Here are a few examples: Low combustion pressure â poor performance. Exhaust gets into the coolant â leads to overheating. Coolant gets into the oil â poor lubrication and possible engine damage.
Your ride's fuel tank vent valve might be defective. This valve is responsible for pushing out the air that settles in the space intended for the fuel. If the valve malfunctions and air cannot vent, then the fuel won't get in.Mounted on top of the fuel tank, this valve vents to the charcoal canister.When your vehicle is parked, the contents of the fuel tank release vapors that are usually collected in the charcoal canister.As soon as the engine runs, the fuel tank vent valve sends these gases into the combustion system.Venting of these gases must not happen when the engine has not yet reached a certain operating temperature. Or else, the engine won't run properly when idling or when it is cold.s soon as the engine runs, the fuel tank vent valve sends these gases into the combustion system. Venting of these gases must not happen when the engine has not yet reached a certain operating temperature. Or else, the engine won't run properly when idling or when it is cold.