318 Can't keep fuel in filter, stalls when hot.

Byron Gray said

So the tank I put in looks like this. That port on top that I thought was a vent started leaking gas out if it when I filled it up

Click to expand...

Ok a 67 should have a dedicated vent line welded into the filler neck up in the trunk. This should have a tube going up and over up high near the quarter "top" and back down along the filler tube, through the gasket, and open ends into the rear frame rail. THAT IS the vent

that newer tank having the extra line COULD BE USED FOR a vapor return There are at least 3 or 4 Wix filters, different sizes, with a built in vapor port.