The filler tube itself is actually one hose inside another. The larger vent at the filler tube is the one that's supposed to vent at a high flow rate during filling. This smaller vent doesn't affect filling at the pump. The check valve prevents spillage in case the truck rolls over. The one on top slowly vents through a check valve as the engine pumps fuel out of the tank. Looking more closely at how the stock tank worked, I learned that there's actually two vents: One on the top of the tank that vents through a small hose to air, and another that vents through the filler tube to the gas cap. I really didn't want to modify or remove the tanks if I could avoid it. There's lots of solutions too, including adding vent lines to the tank or even installing custom aftermarket tanks. Looking for a fix online, I found that many people had run into this problem. A really solid truck! But on the first trip to the gas pump I discovered that both fuel tanks had to be filled very slowly or they would back up and overflow. Recently, I bought a 1997 F250 with the 7.3L Diesel. If you have a 4" lift or greater, please check with S&B before ordering as the angle of the driveshaft may cause the tank to touch the driveshaft.Simple fix for fuel tank filler vent problem This tank does contour under the driveshaft in the front. There is no way to change the DTE on the Ram's currently. The fuel gauge will continue to work, but the Distance To Empty will still be calculated based on the stock fuel tank capacity. Tank is designed to work at regular fuel stations. Nozzle at high flow fuel station may continue to "click off". In-bed Auxiliary Fuel Tanks will void the Lifetime Warranty.
We recommend using a siphon or electronic transfer pump.Disconnect and isolate both of the negative battery cables. S&B Tanks recommends removing only an empty or near empty tank for your safety. Drain your original fuel tank before beginning the S&B Installation process.If working on a lift, make sure the vehicle is lifted safely and securely. Make sure the vehicle is in park or the parking brake is set if you plan on working on the ground.
Do not work on your vehicle while the underbody components are hot.If you are missing any parts, please call or text us at (909)-675-1313.Please read the entire product guide before proceeding.
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