Sounds more like problem in the second tank pigtail, or if you opened the tank valve too quickly you could have shut it down. A simple cure for that is just to turn the valve off then turn on slowly.
But I'm thinking it's the pigtail.
Ron W
03 Dodge 2500 SRW,SB,EC
2018 Keystone 25RES
DRZ-400SM
DL-650