Re: runs on 1 tank but not off the other
Drain the tank completely and look carefully inside. There is a fair chance you will find plastic debris from the manufacturing process. This debris gets sucked onto the screen at the end of the tube or if there is no screen it can get sucked into the tube and clog the outlet fitting and work its way into the primer bulb. I experienced this on my own boat some years ago and I began looking into brand new tanks at various stores. To my surprise many of them had a significant amount of this stuff in them.
This is an example of similar debris found in one of my red plastic gas containers. This same material is found in outboard fuel tanks.