fuel pump push pull question school me

Hello again, Reviving this thread again.....I have since put a 90 degree fitting right on the top of the fuel cell so it doesn't have to siphon as high...... I have a new fuel cell in the car with a new inline filter then a new holley electric fuel pump then another new inline filter near the Thermoquad that is clear so I can see the fuel....The fuel filter only gets about 1/4 filled no matter how long I leave the fuel pump run before I start it....The car starts and runs great for a few minutes , great throttle response, but then the fuel in the clear filter slowly dwindles down to very little or nothing within about 10 or 15 minutes or so then it stalls....I have a vent line on my gas tank which I just have a rubber hose on open to the air in the rear of the vehicle.....My question is this, I have the 73 model year TQ and I have the two ports on the carb that normally went to the charcoal cannister plugged off.....was wondering because I looked at my original 73 dart sport with TQ and besides these two lines going to the charcoal cannister, it has 1/4 line going back to the gas tank.....So I am thinking that my problem of the fuel not getting to the carb is because there is no way for the carb to vent....Is this possible and reasonable thinking? If so, would it be OK to run a return line from one of these two ports on the carb back to my vent line on the tank? thanks Paul