Introduction of Fuel Tank Gas Cap

Function of different caps

The caps in different parts of the engine have different functions. The engine radiator caps keep the coolant under pressure and prevents damage to the hoses and radiator. The oil caps make the oil reservoir have a good sealing effect. The diesel fuel caps protect the fuel in the tank from contamination.

Fuel tank gas cap

Basic knowledge

The gas cap consists of a plastic body with either a threaded (old cap) or lugs located in the tank filling port neck. Premium caps contain finely calibrated springs and valves. The cap may be standard or locked to minimize the possibility of tampering with the tank. One gas cap can be applied in different models of different engine brands, such as, a shopping site called MyMRO provides high performance aftermarket fuel tank gas cap 77300-33070 for 2003-2009 Toyota 4Runner, 2013-2014 Lexus GS350, 2004-2007 Toyota Tacoma and so on. Therefore, in order to find the right fuel tank gas cap, you’d better know your engine well.

Purpose

Gas caps used to simply cover the opening of the fuel tank fill neck, but eventually strong safety and emissions initiatives pushed gas cap designs to do other tasks. The gas cap is now a major safety component that prevents fuel from backing up into the tank filler in the event of an accident, including a rollover, which helps reduce the chance of fuel spills and their associated hazards. The gas cap is also an integral part of the on-board diagnostic system and the emission control system, which are interrelated. The gas cap prevents fuel vapors from leaking through the filler neck, which can be a major source of hydrocarbon emissions. A leaking or missing gas cap can cause 90 liters of fuel to be released into the atmosphere every year.

Suggestions

Make sure your car's gas cap is properly reinstalled after each refill. If you lose the cap, replace it immediately for safety and emission reasons. A loose gas cap can cause damage to a car's maintenance engine. If you find that the cap is loose, turn it to the right until it clicks. Lights may take several startup and running cycles to reset. In areas where there is an emissions testing scheme, the bearing capacity of the gas cap may be tested. If the cap fails, it needs to be replaced. When you replace your car's gas cap, make sure it is made by a reliable manufacturer and that it is the right cap for the specific make and model. Beware of "one size fits all" caps and low-quality alternatives that may compromise your safety and the car's emissions control system.