69 b body repop gas tanks internal vaccum lines reversed

does anyone understand what this is with repop gas tanks and their internal fuel vaccum lines the short and long lines reversed oppose to the original gas tanks internal lines as far as what to connect to what long and short internaltank vaccum lines? i do not have a original to compare to. thanks

hi mopar,yes the tank vents are reversed on repop/aftermarket fuel tanks. if youre facing the sending unit ,the original tank vent tube on the left nipple is approx. 32" long on original tanks and gets connected to the outside "J" tube. the right side nipple gets connected to a tank tube vent that's approx 6" long inside the tank, that hooks up to the vent that goes over your shock crossmember in your trunk. the problem starts on repop tanks when you fill them up and slam on the brakes,the fuel rushes to the front of the tank and gushes out the J tube and dumps on your diff and the ground because the inside tube is REVERSED and only 6" long not 32". happy thanksgiving ronnie

Does anyone have pictures of the routing described? My road runner drips out of the vent line when full.

Thanks

Pat

look in your factory service manual you will see the pic of tank with vaccum lines attached to vac ports.