how to test a vented gas cap
Today’s gas cap features a ratcheting mechanism to ensure the right seal. The vented gas cap has a chamber under the plastic cap handle that inserts into the fuel fill line. In some car models, your car could run poorly or even fail to start. In addition, it leaks gas out of the vented cap when cornering if the tank is more than 1/2 full. Some cars require you to push a button by the seat or in the glove box, while others allow you to open it manually. His work has been featured in Car Craft, Hot Rod, Rod & Custom, Truckin’, Mopar Muscle, and many more. Open the fuel door on your vehicle. Instead of a traditional cap, there is self-latching seal door that prevents the vapors from escaping. Jefferson operates Red Dirt Rodz, his personal garage studio, where all of his magazine articles and tech videos are produced. Required fields are marked *. Grab the fuel cap and turn it to the left to remove it from the tank. Checking your fuel cap takes only a few seconds after each fill-up. A missing cap certainly causes those same issues, but also you run the risk of burning down your ride. By the mid 90s, fuel vapor controls were 50 times more strict than in 1971. The most common cause of a lit check engine light is not a bad sensor, it is a loose gas cap. Today’s fuel systems require a complete seal on the tank, without it, there can be issues.
The lowly gas cap.
The cap screws shut, and this chamber fits relatively close inside the intake tube of the fuel line running to the tank. If the rubber seal on the fuel cap isn’t sealing, because the cap is loose or cross threaded, the test fails. All Rights Reserved. The sealing materials went from cork or cloth gaskets to neoprene and polyurethane materials for better resistance from chemical deterioration. Safety concerns are obvious- reduce the fire danger of spilled fuel, especially in the event of an accident. In some car models, your car could run poorly or even fail to start. When the pressure reaches a certain point (defined by so many pounds per square inch) the valve opens … This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. Older vehicles had a simple 2-prong mechanism, whereas today’s vehicles use threads. Automotive expertise from NAPA AUTO PARTS. This second kind of pressure is taken care of through the operation of the fuel pump mechanism, as the vented gas cap needs to be the one-way flap to keep evaporated gas fumes in.
The P0440 – P0459 series of diagnostic trouble codes are set depending on the results of this automatic test. Today’s fuel systems require a complete seal on the tank, without it, there can be issues. On each side of the chamber are small openings where air is able to enter. Beginning in 1971, US-licensed cars had to have evaporative controls built into the fuel system, and this all starts with the gas cap. A cracked cap or missing seal will allow fuel vapors to escape from the tank, and over time will cause fuel economy to drop, costing you at the pump. In fact, a missing or incorrectly installed gas cap can cost you as much as 30 gallons over the course of a year. It always takes forever to fill the tank or it will burp back up all over the fender. The vented gas cap is designed to vent small amounts of air into the car gas tank line. A modern gas cap serves several functions. For more information on why you need to check your gas cap, chat with a knowledgeable expert at your local NAPA AUTO PARTS store.
THE STOCK DR650SE GAS CAP… The real purpose of this thread is to share the disassembly process of the stock gas cap and show you what had plagued this bike for a number of years.
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