Tim asked earlier about the venting on my tank which sets directly under the seat and you have to raise the right side of the seat to take the gas cap off.
I'm not sure if a 38 tank is made this way to vent but here is some info on the 37 for those interested. This is a pic out of the 37 repair manual.
Just as info....

http://i140.photobucket.com/albums/r19/LutherParris/Ole%20Blue%201937/IMG_0001_zps12f250ea.jpg


1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
More photos
1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile