Hi guys, quick question

Where should the stock fuel line attach to the tank? Just beside the fuel gauge sender on top of the tank, or should that be the evacation? A friend belives that should be the evac, but I told him the evac is thru the gastank lid? But now I am not shure,
His fuel line is attached to the fitting in the bottom of the tank, what I thaught was a drain plugg only?

Can someone spread some light please?

Thanks in advance!

 

I am talking about stock 56 cab gas tank

 

You are correct. The top connection is for the fuel feed(you'll see it has an internal pipe almost to the bottom of the tank), the bottom plug is purely a drain point, and the fuel cap must be vented.

 

Great thanks, a big thanks!

Jimmy

 

Does anyone know more in detail how the vented gas tank work to let the air in but keep the gas inside (when full)

 

It's usually just a rubber flap that seals it, but can bend inwards to let air in. The metal part of the cap has a path for air around the seal, a small hole usually.