Thread: Gas tank pressure?

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There's more than one type of rollover valve. Some are made to be remote mounted and others are made for in-tank mounting. I have a tank mounted model, but for some reason it says they work best with a short filler neck. My filler neck was short at one time, but now it's at least 3 feet long and a lot higher. Maybe I'll switch to a remote model. The problem there is getting it high enough and vented outside the car. I'd need a hose on both sides of the valve to accomplish that.

Remote Mount Rollover Vent Valve

In Tank Rollover Vent Valve

Tech 101: The Hows and Whys of Installing a Tanks Inc. Rollover Vent Valve - OnAllCylinders

The check ball in a rollover valve is steel and won't float. When upside down, it will sink and do it's job.

If a tank builds up pressure, the rollover valve check ball may be stuck closed. A vented cap should not be need in addition to a rollover valve that provides venting.