gas tank vacuum

[47clubcoup]

iv got a 47 lincoln club coupe.its in my garage , i went to put gas in it and it spit it back out.....when i opened the tank cap it had vacuum like it should......where is the vent as im thinking that is plugged. thank you for your input...........mike

[Beltfed]

My '38 has the vent tube running down the filler pipe on the inside.  Unsure if they changed later.

[ralphnof49]

My 47 has no separate venting. The cap must have the vent in it.

[peecher]

Mike, The cap is vented.

[1941]

2 Years ago , I had to drop the tank on my '41 Continental to clean out the tank. I also replaced the sender gasket. On my first

test drive . the car kept stalling out. It was when I loosened the (aftermarket ) gas cap that I felt the vacuum created from a sealed

system. After I drilled a tiny vent hole in the cap  all was well.

[larry butcher]

Mike, checked  the fill pipe on my '38  and my '38 spare tank and these tanks have a  3/8"  pipe running down the inside and also a small  pipe about 3" installed just below the

fill cap. This vents right to the outside. Now on my '48 the fill pipe is a different design altogether, no inside vent pipe , just a plain fill pipe with a rubber sleeve  connecting

the pipe to the tank neck. The gas cap is stainless steel, plain ; with a knurled edge.   BUT!  inside there is a small ( 1/8"?) hole drilled through the locking piece BUT not through 

the stainless body of the cap.This the vent. I think this the original  cap.--- Larry

[47clubcoup]

thanks to all who gave me advise i will try them and see what comes of it .again i thank you.