Holstein13, LOL, that might be an option!!!
The other day was the first time that I filled on both sides at the same time. Never did that on the other coach. I was fairly low on diesel and wanted to fill faster.
I guess I was concerned that one nozzle might push fuel out the other side. Just before the tank was full, as I had an idea how much fuel I was needing, I turn off the satellite pump and continued with the main pump. No fuel spilled.
I didn't know that the DEF tank had an overflow tube. The filler is on the driver's side and the overflow tube exits on the passenger side under the coach. As I mentioned, it was hard to know if the little tank was fuel as it kept clicking off from the start.
MM.