Fuel tank & filler venting

[eliminator]

I would make it another 2 inches higher. Just look at the top of it in realtionship with the fuel filler, If you had fuel in the filler neck up close to the cap which would be higer? If the fuel in the filler neck gets higer than the vent it will push the fuel out the vent.

[Jerry Cowing]

I drive a 427 S/C, but I might have an easy solution for you. Why don't you try running a 1/8" copper tube down the inside of your filler tube. Make it long enough so that it extends just past the bottom end of your filler tube (just guessing, but let's say 3 feet long for an FIA application). You want to keep the bottom end of the copper tube out of the gas in the tank, but long enough that it extends past the end of the filler tube into the tank's air space. Attach the top of this copper tube to the inside of the filler cap frame so that when the filler cap is closed the top of the copper tube is sealed against the rubber gasket.

Reasoning: When filling your tank, the air is being displaced and pressurized by the fuel filling the tank. The air has to go somewhere, so if you give it an escape path, other than the filler tube the fuel is passing through, the air can escape and not burp back up and out of the filler tube. When filling the tank, the incoming fuel will pass down and outside this 1/8" copper tube and the air will simultaneously pass up through the inside of the copper tube thus deceasing air pressure and preventing burping.

[Naumoff]

I made my own gas tank vent and charcoal filter out of black pipe and fittings and a vent limiter from a natural gas regulator.

[sllib]

Try these folks: www.mcmaster.com.
Bill Stradtner

[TurnpikeBoy]

Thanks, Bill, looks like they may have something.

I made my own gas tank vent and charcoal filter out of black pipe and fittings and a vent limiter from a natural gas regulator.

Hee, hee, heeeeeee.........plummers..........didja put the wax ring under the seat?


-Roger

[Naumoff]

Thanks, Bill, looks like they may have something.




Hee, hee, heeeeeee.........plummers..........didja put the wax ring under the seat?


-Roger

Yes. On the passenger seat with a hole cut in the middle.
No messy clean ups after I give someone a ride.