![]() With today’s modern fuels, the alcohol and additives create a fuel that expands much more than what it used to. You can even get an OE-vented, locking-style gas cap! If you pony up the cash and buy a vented cap, most enthusiasts would assume that would eliminate the need to run a vent line from the gas tank. There are the standard OE-type caps, locking-type caps, or vented-type caps. What About Vented Gas Caps?Īs anyone that has had to shop for a replacement gas cap can tell you, there is more than one kind of gas cap on the shelves. With modern fuels, this may not be the answer to all of your vapor pressure problems. Twist on gas caps, like this one from Tanks Inc., may be offered in a pressure vented style. “The other issue that we do sometimes run across is simply the filler neck does not have enough drop in it to allow for fuel to gravity feed to the tank,” he added, “Or there are too many tight bends causing the fuel to flow slowly.” “This oversized filler neck allows for air to escape during filling,” he pointed out. Here are a few examples of different tank filler necks from Tanks Inc.Īccording to Justin, the standard 5/16-inch line commonly used as fuel tank vents, “is not enough to properly vent a tank during filling.” However, most enthusiasts don’t realize this because the tank’s filler neck is larger than the fuel pump nozzle. Some fuel tank necks come with integral vent lines. Higher pressure can lead to dangerous conditions like tank bulging, fuel line leaks, fuel pump problems, insufficient fuel to the engine, or potential fire hazards when opening the filler cap. It is these changes in volume due to temperature changes that make gas tank venting necessary.”īasically, an automobile’s gas tank or fuel cell will build pressure naturally. “The change in air and gas volume in a tank will greatly change with temperature change and probably more so than what most people realize. The change in air and gas volume in a tank will greatly change with temperature change, and probably more so than what most people realize. ![]() Additionally, the air inside of a gas tank also changes in volume with temperature changes,” he says. “Gasoline expands and contracts with temperature changes. ![]() According to Justin Somerville, the general manager at Tanks Inc., thermal expansion in a fuel cell is a big deal. In automotive terms, thermal expansion works a little differently. ![]() Should that tube be connected to my vent line? Could somebody provide me with pictures of their T joint in their vent tube line? Will this fix my issue? I have a big run with my riding group this Saturday (the 17th) and would be at much more ease if I didn't have to worry about my bike.Moonshiners capture the vapor and using a vent line, route the vapor to another vessel where it is cooled, and transitioned back to a liquid state. After a little looking around I noticed another hose (clearly had no fluids ran through it before) which was stretched at the end as thought it was connected to something at one point but was no longer (it ran along side my vent tube for a while then shot under the tank towards the carbs). After following my vent tube down and locating it in this area I noticed that it had a T split in the line. My left side cover (the one that goes over the main clutch adjustment by the clutch lever) had been removed for some repairs I did in the left crankcase. After some asking around locally I was informed that it sounded like my tank was not venting properly as I could simply start the bike back up and keep going. I have a 1998 Honda Shadow Aero 1100 and I have had issues recently with it dying out as if it was out of fuel (Obviously it is not). ![]()
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