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Just recently did this same set up with Pollack ) port and external fuel pumps. Problem: when I am switched to main tank and run bronco, after about 5 minutes, gas starts spewing out of the gas cap of the front auxiliary tank. Is this some type of vent tube issue or plumbed incorrectly?

How would the rear tank be filling up the front tank? Shouldn’t everything be going through the selector 6-port valve?

I have a 74 and about a 2 years ago I replaced the 4bl carb with the Holley Sniper. With the original tanks we tried to bung them together in order to use one in-line exterior fuel pump. It didn’t work. Then I bought the Holley 534-38 dual fuel kit made for this application. I pulled all the...