... Safely vent any trapped gas pressure between valve #1 and valve #2. Safe and Efficient Testing for Gas Train Safety Safety Note. (f) Open manual shut-off valve A, then close leak test apparatus. As a solution, I wonder if I might drill a very small hole in the center of the bottom of the cap, and a small hole in the top of it. Now, each time I take off the gas cap, air rushes into the gas tank, because that tank is no longer vented, as my gas cap is not of the vented variety.

The vented gas cap is designed to vent small amounts of air into the car gas tank line. If there was no way to fill that vacuum, it might overcome the pressure of the fuel pump and your motor would starve for want of gas. This 1/8th turn design is there to alert the driver that the cap is installed correctly, if it doesn’t click, it is not on right. For example, Next time you drink something use a straw. The New "Large" Regular price $ 75 00 $ 75.00. The vented gas cap has a one-way release valve that is pressure-activated. An illuminated Check Engine Light is another symptom of a potential issue with the vehicle’s gas cap. An improperly sealing fuel cap may cause an evap system leak, which will set off the Check Engine Light when the the computer detects the leak. When the pressure reaches a certain point (defined by so many pounds per square inch) the valve opens … As the fuel pump sucks fuel out of the tank, the fuel's departure creates a small vacuum inside the tank. I have a manual and the fuel cap must vent. When a fully enclosed container (sealed) holds a fluid, in order to pour out this fluid the remaining volume must be replaced with air. You cannot put fuel into your tank, unless you can get the air out...and you cannot withdraw fuel from your tank unless you can let air in. The gas cap code is a common diagnostic trouble code that might turn your check engine light on. Ferguson is the #1 US plumbing supply company and a top distributor of HVAC parts, waterworks supplies, and MRO products. Today’s gas cap features a ratcheting mechanism to ensure the right seal. Installing a new gas cap is a very simple procedure, but the exact steps can vary depending on the type of gas cap you have. Regular price $ 595 00 $ 595.00. Thanks so much for the info.....this is very helpful. If there was no vent, nothing would flow out at all. I will only be painting the vent above the roof boot and the vent cap. The gas cap on my 2003 Pontiac Vibe used to make a slight sound of "pssstt..", the sound of some air either entering or exiting from the tank as I was opening the cap. In some states, emissions testing is even reaching into the gas cap area. The gas cap is a part of the vehicle’s evaporative emissions system and can cause problems with the system if it has an issue. Two months ago, the gas cap stopped making that sound when I unscrew it to fuel, even though I still tighten it quite firmly after fueling. All outboard motors have vented gas tanks. Shop for Gas Vent Caps at Ferguson. Palm or Three-way Valves to Enhance Testing Access ... case, the vent being open on a high gas pressure switch line would bleed off pressure in such a way that the switch would not accurately sense the gas train pressure.

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