the tank I bought has no vent in it at the front center. the car never had any charcoal canister on it, so the tank that was on there was wrong and that was why the vent was plugged off, obviously to keep gas from spilling out.
the filler neck seems to be correct that is on there since it has to vent somehow, so i'll keep the original filler neck tube.
the gas cap that has been on the car for decades looks like to me is vented. it has a little hold inside of a plastic piece on the underside of the cap.
the problem I call vapor locking I originally thought was ignition related. I changed the car from points to the mopar electronic ignition to eliminate that as a problem. new system works fine.
car was running fine and I drop to a gas station and waited for my wife with the car idling. it was fine, then about 10 min later it started to act like it was going to die and it was down on power. so I revved the gas and it reved up fine. got my wife to hurry up....thinking I was loosing the ignition again....and we took off. car drove fine down the road. then I dropped it down to 1st gear and floored it.....got to the top of 2nd gear and it started to just give up....like no power...or lack of ignition or gas. I got out of it and it drove fine again.
the car used to have an aftermarket fuel pump with rubber line going to the carb. I put the stock style fuel pump on it....but high volume version (brand new).....with the correct metal lines with metal fuel filter going to the carb.
my only thoughts are this.....picked up trash from the tank that was stopping up the fuel pump dropping pressure and not keeping up at WOT. (when I dropped the tank today...the sending unit had no sock on it....no idea why. and it did have some minor sediment in the tank)
or the other thought is that it is vapor locking.....which is why it did it after idling for 10 min.
when I got home I let it idle and it did fine. granted the hood was up. checked my timing and all was well.....so I'm clueless.
can't blame it on points anymore...so it has to be either vapor lock or trash getting to the fuel pump dropping pressure.
fuel pump registered at 6.5 psi when I tested it.
or maybe it is just shitty gas...crap gas with water in it. but I saw no floating water today when I looked into the tank.
my dad wants to go back to the rubber line, but I hate the way it looks...I like the metal line with the stock filter.
carb is a brand new edelbrock, which when this problem first start I took the top off and checked for trash...there was none...and I cleaned the passages to make sure.
here is the link to my project blog where you can see all the stuff I have done. I'm putting in a new gas tank, trunk seal, neck seal, tank pad, ss gas line, rubber hoses, sending unit, etc.
http://www.forabodiesonly.com/mopar/showthread.php?t=263029